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Model

Chai-1

Chai-1 predicts the structures of biomolecular complexes containing proteins, nucleic acids and small molecules.

Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

5 evaluations · 5 metric rows

How it worksChai-1 workflow
Chai-1 workflow1. Sequences and molecules. Then: 2. Optional MSA, template or restraints. Then: 3. Chai-1 inference. Then: 4. Complex structuresChai-1 workflow1. Sequences and molecules. Then: 2. Optional MSA, template or restraints. Then: 3. Chai-1 inference. Then: 4. Complex structuresChai-1 workflow1. Sequences and molecules. Then: 2. Optional MSA, template or restraints. Then: 3. Chai-1 inference. Then: 4. Complex structures

Conceptual summary of the documented data flow; optional inputs and configured downstream stages must be reported for a reproducible evaluation.

Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Overview

limited source coverage · Automated source review, 2026-09-16. All specifications and missing details

Evaluations and results

5 evaluations · 5 metric rows. Different protocols are not a single leaderboard.

Filter evaluations

Applied filters: All linked evaluations

Exact evaluated configurations and original reported results
Tested configurationProtocol and datasetFindingEvidence and details
Configuration: Chai-1 (MSA)Protocol: ESMFold2 Runs N’ Poses reported comparison msa: Runs N’ Poses ligand pass rate (MSA)
Dataset subset: Runs N’ Poses complete-case intersection: 2,573 scored ligands (ESMFold2 Runs N’ Poses reported comparison split)
59% ligand_pass_rate
percent · higher

Uncertainty: Not reported

Coverage: unit: ligands; scored: 2573; eligible: unreported; note: Complete-case intersection; source 2600 systems is not a ligand denominator.

Author-reported evaluation · source checked
Methods, coverage and source

Chai-1 (MSA) on ESMFold2 Runs N’ Poses reported comparison msa: Runs N’ Poses ligand pass rate (MSA)

Runs N’ Poses receptor–ligand co-folding; source benchmark 2,600 systems. Figure 2C reports n=2,573 scored ligands on the intersection where all models produced valid predictions, after excluding undefined SuCOS scores. Multiple ligands in one system are scored independently. Five seeds × five diffusion samples per target; select top candidate by ipTM. Success requires lDDT-PLI >0.8 and BiSyRMSD <2 angstrom. Baselines use 10 recycles and 200 diffusion steps; ESMFold2 uses 10 or 20 loops as labelled and truncated 68-step diffusion. Single-sequence and MSA conditions remain separate.

Aggregation: Not reported

ESMFold2 primary paper v1, Figure 2C Runs N’ Poses · PDF page 5, Figure 2C, Runs N’ Poses subpanel (right), msa block, bar 5 from left (Chai-1 (MSA)), exact printed bar label
Configuration: Chai-1 (single sequence)Protocol: ESMFold2 Runs N’ Poses reported comparison single-sequence: Runs N’ Poses ligand pass rate (single sequence)
Dataset subset: Runs N’ Poses complete-case intersection: 2,573 scored ligands (ESMFold2 Runs N’ Poses reported comparison split)
51% ligand_pass_rate
percent · higher

Uncertainty: Not reported

Coverage: unit: ligands; scored: 2573; eligible: unreported; note: Complete-case intersection; source 2600 systems is not a ligand denominator.

Author-reported evaluation · source checked
Methods, coverage and source

Chai-1 (single sequence) on ESMFold2 Runs N’ Poses reported comparison single-sequence: Runs N’ Poses ligand pass rate (single sequence)

Runs N’ Poses receptor–ligand co-folding; source benchmark 2,600 systems. Figure 2C reports n=2,573 scored ligands on the intersection where all models produced valid predictions, after excluding undefined SuCOS scores. Multiple ligands in one system are scored independently. Five seeds × five diffusion samples per target; select top candidate by ipTM. Success requires lDDT-PLI >0.8 and BiSyRMSD <2 angstrom. Baselines use 10 recycles and 200 diffusion steps; ESMFold2 uses 10 or 20 loops as labelled and truncated 68-step diffusion. Single-sequence and MSA conditions remain separate.

Aggregation: Not reported

ESMFold2 primary paper v1, Figure 2C Runs N’ Poses · PDF page 5, Figure 2C, Runs N’ Poses subpanel (right), single-sequence block, bar 1 from left (Chai-1 (single sequence)), exact printed bar label
Configuration: Chai-1Task: Lipid–protein binding pose
Dataset: LiPP lipid–protein complexes
60.7 Success rate, ligand all-atom RMSD <2 Å
% · unknown

Uncertainty: 95% CI 55.2–66.0

Coverage: Not reported scored / Not reported eligible

Independent external evaluation · source checked
Methods, coverage and source

Chai-1: Lipid–protein binding pose

Top-scoring pose; all-atom lipid RMSD below 2 Å.

Aggregation: Not reported

The LiPP Benchmark Set for Modeling Lipid–Protein Complexes: Comparison of Co-Folding and Docking Methods · Table 2, Chai-1 row, LiPP (N=331) % Success Rate column
Configuration: Chai-1Task: Antibody–antigen interaction prediction using folded complexes
Dataset: Antibody–antigen GEP test set
0.86 AUC-ROC
unitless · unknown

Uncertainty: ± 0.07

Coverage: Not reported scored / Not reported eligible

Independent external evaluation · source checked
Methods, coverage and source

Chai-1: Antibody–antigen interaction prediction using folded complexes

Interaction classifier evaluated using Chai-1-folded input complexes; this is pipeline AUC, not DockQ.

Aggregation: Not reported

Enhancing antibody-antigen interaction prediction with atomic flexibility · Table 5, Folded row, Chai-1 (no MSA) column
Configuration: Chai-1Task: Antibody loop structure prediction
Dataset: ImmuneBuilder antibody test set
2.65 Mean CDR H3 RMSD
Å · unknown

Uncertainty: Not reported

Coverage: Not reported scored / Not reported eligible

Independent external evaluation · source checked
Methods, coverage and source

Chai-1: Antibody loop structure prediction

Backbone RMSD after framework alignment; one seed and one diffusion trajectory.

Aggregation: Not reported

Conformation-aware structure prediction of antigen-recognizing immune proteins · Table 1, Antibodies / Chai-1 row, CDR H3 column

Source checking is not independent reproduction. Release 2026-09-23-2b89723c6dd9.

Use this model

How it works, versions and access

Versions and evaluated configurations

How it works

How it works

Chai-1 predicts the structures of biomolecular complexes containing proteins, nucleic acids and small molecules. An AlphaFold3-like structure architecture dominated by pair-biased self-attention, with additional protein-language-model embeddings and optional inter-chain constraint features. The documented inputs are FASTA sequences, ligand SMILES and optional alignments, templates, contacts or covalent-bond restraints. The output consists of sampled complex structures; the default command produces five predictions.

Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
Versions and reproducibility

Chai-1; README installation example pins chai_lab 0.6.1. The applicable input limits require configuration-specific checking.

Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
Strengths, limitations and unresolved questions

Strengths and limitations

Limitations and conditions

Profile review details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Stable record: catalog-model-chai-1

Specifications

Inputs, training, access and other details

Explanatory profile: limited source coverage · Automated source review, 2026-09-16. Review applies to the cited claims; unresolved fields are listed below. Numerical results retain their own review status.

Inputs, outputs and configuration
PropertyDescription and evidence
Model typeMultimodal biomolecular structure predictor
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
ArchitectureAn AlphaFold3-like structure architecture dominated by pair-biased self-attention, with additional protein-language-model embeddings and optional inter-chain constraint features.
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
InputsFASTA sequences, ligand SMILES and optional alignments, templates, contacts or covalent-bond restraints.
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
OutputsSampled complex structures; the default command produces five predictions.
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
ParametersThe September 2024 report specifies a 3B protein-language-model component but does not state a complete predictor total in the reviewed architecture sections. · Not reported in inspected sources
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
Known versionsChai-1; README installation example pins chai_lab 0.6.1.
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
Training dataPDB structures and AlphaFoldDB distillation, with optional MSAs/templates. The technical report describes no other AlphaFold3 distillation datasets; server MSA search differs from the paper evaluation pipeline.
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
Training cutoffPDB structure and PDB70-template release cutoff: 2021-01-12, according to the September 2024 technical report.
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
Context limitsThe reviewed report and inference README do not specify one validated maximum for all protein, nucleic-acid and ligand inputs; resource requirements and molecular composition remain relevant. · Not reported in inspected sources
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
Weights licenceApache-2.0; README Licence explicitly covers code and weights.
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
AccessOfficial project documentation and implementation: https://github.com/chaidiscovery/chai-lab
Sources (2)chaidiscovery/chai-lab: README.md; chai1-web: Browser-extracted primary-paper passages · Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence
Code licenceApache-2.0
Sourceschaidiscovery/chai-lab: LICENSE · LICENSE: licence text

Evidence

Source checking verifies the cited claim or transcription. It does not establish independent reproduction.

Evidence table

Inspect claims, sources and review details

Trace each statement to its source and review. A context-only reference supports the record generally; it does not verify an individual field. Source checking does not reproduce an experiment.

One row per statement and cited source. Multiple citations are not independent evaluations. Shared locators are labelled explicitly.

39 evidence rows matching the loaded filters

Claims, original sources and review scope · Release 2026-09-23-2b89723c6dd9
Property and statementOriginal source and locationReview and provenance
Diagram caption
Conceptual summary of the documented data flow; optional inputs and configured downstream stages must be reported for a reproducible evaluation.
Individual claims
chaidiscovery/chai-lab: README.md

Original source ↗

Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Shared locator for this statement’s cited sources; not a separate locator for each citation.

Version: 66c38d1fe5c6756a89ff8596b1dea87d305ec06f
Retrieved: 2026-09-16T19:46:18.824295+00:00

source checked

automated source review · 2026-09-16

Audit details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Field: attributes.profile.diagram.caption

Source artifact SHA-256: ea6f6e64f6fc73d0e3dcbe6755c2aab226fa13bad279d1213acc0217f3f5013f

Hash scope: SHA-256 of retrieved original artifact bytes

Format: original_artifact

Inspected artifact

Diagram caption
Conceptual summary of the documented data flow; optional inputs and configured downstream stages must be reported for a reproducible evaluation.
Individual claims
chai1-web: Browser-extracted primary-paper passages

Original source ↗

Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Shared locator for this statement’s cited sources; not a separate locator for each citation.

Version: Technical report v1, 9 September 2024; browser-extracted passages pp.1–2,7–10
Retrieved: 2026-09-16T20:25:06.247632+00:00

source checked

automated source review · 2026-09-16

Audit details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Field: attributes.profile.diagram.caption

Source artifact SHA-256: 8b6fcde51e45e97254308fead77ad8dae47d9990e5d6052221ce185644798608

Hash scope: SHA-256 of browser-extracted text artifact, not original PDF bytes; direct HTTP download returned403.

Format: browser_extracted_text

Inspected artifact

Diagram steps
  • Sequences and molecules
  • Optional MSA, template or restraints
  • Chai-1 inference
  • Complex structures
Individual claims
chaidiscovery/chai-lab: README.md

Original source ↗

Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Shared locator for this statement’s cited sources; not a separate locator for each citation.

Version: 66c38d1fe5c6756a89ff8596b1dea87d305ec06f
Retrieved: 2026-09-16T19:46:18.824295+00:00

source checked

automated source review · 2026-09-16

Audit details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Field: attributes.profile.diagram.steps

Source artifact SHA-256: ea6f6e64f6fc73d0e3dcbe6755c2aab226fa13bad279d1213acc0217f3f5013f

Hash scope: SHA-256 of retrieved original artifact bytes

Format: original_artifact

Inspected artifact

Diagram steps
  • Sequences and molecules
  • Optional MSA, template or restraints
  • Chai-1 inference
  • Complex structures
Individual claims
chai1-web: Browser-extracted primary-paper passages

Original source ↗

Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Shared locator for this statement’s cited sources; not a separate locator for each citation.

Version: Technical report v1, 9 September 2024; browser-extracted passages pp.1–2,7–10
Retrieved: 2026-09-16T20:25:06.247632+00:00

source checked

automated source review · 2026-09-16

Audit details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Field: attributes.profile.diagram.steps

Source artifact SHA-256: 8b6fcde51e45e97254308fead77ad8dae47d9990e5d6052221ce185644798608

Hash scope: SHA-256 of browser-extracted text artifact, not original PDF bytes; direct HTTP download returned403.

Format: browser_extracted_text

Inspected artifact

Diagram title
Chai-1 workflow
Individual claims
chaidiscovery/chai-lab: README.md

Original source ↗

Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Shared locator for this statement’s cited sources; not a separate locator for each citation.

Version: 66c38d1fe5c6756a89ff8596b1dea87d305ec06f
Retrieved: 2026-09-16T19:46:18.824295+00:00

source checked

automated source review · 2026-09-16

Audit details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Field: attributes.profile.diagram.title

Source artifact SHA-256: ea6f6e64f6fc73d0e3dcbe6755c2aab226fa13bad279d1213acc0217f3f5013f

Hash scope: SHA-256 of retrieved original artifact bytes

Format: original_artifact

Inspected artifact

Diagram title
Chai-1 workflow
Individual claims
chai1-web: Browser-extracted primary-paper passages

Original source ↗

Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Shared locator for this statement’s cited sources; not a separate locator for each citation.

Version: Technical report v1, 9 September 2024; browser-extracted passages pp.1–2,7–10
Retrieved: 2026-09-16T20:25:06.247632+00:00

source checked

automated source review · 2026-09-16

Audit details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Field: attributes.profile.diagram.title

Source artifact SHA-256: 8b6fcde51e45e97254308fead77ad8dae47d9990e5d6052221ce185644798608

Hash scope: SHA-256 of browser-extracted text artifact, not original PDF bytes; direct HTTP download returned403.

Format: browser_extracted_text

Inspected artifact

Model type
Multimodal biomolecular structure predictor
Individual claims
chaidiscovery/chai-lab: README.md

Original source ↗

Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Shared locator for this statement’s cited sources; not a separate locator for each citation.

Version: 66c38d1fe5c6756a89ff8596b1dea87d305ec06f
Retrieved: 2026-09-16T19:46:18.824295+00:00

source checked

automated source review · 2026-09-16

Audit details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Field: attributes.profile.facts.0.value

Source artifact SHA-256: ea6f6e64f6fc73d0e3dcbe6755c2aab226fa13bad279d1213acc0217f3f5013f

Hash scope: SHA-256 of retrieved original artifact bytes

Format: original_artifact

Inspected artifact

Model type
Multimodal biomolecular structure predictor
Individual claims
chai1-web: Browser-extracted primary-paper passages

Original source ↗

Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Shared locator for this statement’s cited sources; not a separate locator for each citation.

Version: Technical report v1, 9 September 2024; browser-extracted passages pp.1–2,7–10
Retrieved: 2026-09-16T20:25:06.247632+00:00

source checked

automated source review · 2026-09-16

Audit details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Field: attributes.profile.facts.0.value

Source artifact SHA-256: 8b6fcde51e45e97254308fead77ad8dae47d9990e5d6052221ce185644798608

Hash scope: SHA-256 of browser-extracted text artifact, not original PDF bytes; direct HTTP download returned403.

Format: browser_extracted_text

Inspected artifact

Architecture
An AlphaFold3-like structure architecture dominated by pair-biased self-attention, with additional protein-language-model embeddings and optional inter-chain constraint features.
Individual claims
chaidiscovery/chai-lab: README.md

Original source ↗

Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Shared locator for this statement’s cited sources; not a separate locator for each citation.

Version: 66c38d1fe5c6756a89ff8596b1dea87d305ec06f
Retrieved: 2026-09-16T19:46:18.824295+00:00

source checked

automated source review · 2026-09-16

Audit details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Field: attributes.profile.facts.1.value

Source artifact SHA-256: ea6f6e64f6fc73d0e3dcbe6755c2aab226fa13bad279d1213acc0217f3f5013f

Hash scope: SHA-256 of retrieved original artifact bytes

Format: original_artifact

Inspected artifact

Architecture
An AlphaFold3-like structure architecture dominated by pair-biased self-attention, with additional protein-language-model embeddings and optional inter-chain constraint features.
Individual claims
chai1-web: Browser-extracted primary-paper passages

Original source ↗

Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence

Shared locator for this statement’s cited sources; not a separate locator for each citation.

Version: Technical report v1, 9 September 2024; browser-extracted passages pp.1–2,7–10
Retrieved: 2026-09-16T20:25:06.247632+00:00

source checked

automated source review · 2026-09-16

Audit details

Inspected pinned official documentation, relevant implementation files and named primary-paper sections. Claims are limited to those artifacts. Remaining field extraction and identity conflicts are explicit; no new performance claims, model runs or human review are implied.

Field: attributes.profile.facts.1.value

Source artifact SHA-256: 8b6fcde51e45e97254308fead77ad8dae47d9990e5d6052221ce185644798608

Hash scope: SHA-256 of browser-extracted text artifact, not original PDF bytes; direct HTTP download returned403.

Format: browser_extracted_text

Inspected artifact

Sources and history

View linked audit checks and correction history

Release 2026-09-23-2b89723c6dd9 · Record review: discovered

4 source records and release historyDownload this release
Technical metadata and extraction receipts

Stable ID: catalog-model-chai-1

areas
proteins-complexes; molecular-interactions
method types
foundation model
entity level
family
version
released weights
reported name
Chai-1
access
Public code and weights under Apache 2.0; substantial compute required.
method type
foundation model
historical missing metadata
checkpoint revision: not_yet_extracted; training data: not_yet_extracted; licence: not_yet_extracted
metadata review scope
historical_missing_metadata preserves the original discovery state. Current descriptive evidence and missingness are recorded in profile.facts; numerical-result review is separate.
entity classification
review date: 2026-09-17; rationale: The cited profile describes a named learned biological predictor or representation model/family. Preserve this identity separately from task-specific fitting, individual checkpoints, pipelines and hosted access.; source ids: evidence-official-affbe2d511ff2a80f457; evidence-official-b91fc1ec601eec6598c3; source locator: Chai-1 Technical Report v1 (9 September 2024), Sections 2.1, 2.7–2.8 and 4.1–4.3; current repository README Licence; ambiguities: None recorded
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