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Pathway Interaction Database (PID)
Developed by NCI CBIIT in collaboration with the Nature Publishing Group (NPG), the PID provides researchers with information about known biomolecular interactions and cellular processes assembled into signaling pathways. It contains data describing 137 human pathways curated by NCI and NPG as well as 322 human pathways imported from Biocarta/Reactome. Pathway categories are provided courtesy of the Rat Genome Database Pathway Ontology.