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CGPD-tetramers are computationally generated information units that interrelate 4 data types at Comparative Toxicogenomics Database (CTD). To generate a CGPD-tetramer by data integration, 5 lines of supporting evidence are required (box) as directly curated interactions among the 4 data types: C, chemical; G, gene product; P, phenotype; D, disease. If any 1 line of supporting evidence is lacking, the tetramer is not generated.
