Figure 1.
From the following article: Understanding environment-disease connections: An introduction to the Comparative Toxicogenomics Database (CTD)

CTD data content. CTD integrates curated data for chemical-gene interactions and chemical- and gene-disease relationships (colored circles) with select public datasets (gray circles; pathways from the KEGG and Reactome databases and GO annotations) to provide novel insights into the complex connections between the environment and human health. Solid lines describe directly curated or integrated relationships and dashed lines describe inferred relationships.




