CTD contains direct and inferred chemical–disease relationships. Direct chemical–disease relationships are curated from the published literature by CTD curators.
Inferred relationships are established via CTD-curated chemical–gene interactions (e.g., chemical A is associated with disease B because chemical A has a curated interaction with gene C, and gene C has a direct relationship with disease B).
Direct and inferred relationships are identified, and help users develop hypotheses about mechanisms underlying environmental diseases. References provide details about the disease relationships.
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