"LinkedLifeData offers a reason-able view to the Pathway and Interaction Knowledge Base (PIKB), which assembles a large fraction of the life-science-related datasets in LOD, e.g. Uniprot, PubMed, Entrez-Gene, UMLS Metathesaurus, BioGRID, DrugBank. It combines more than 20 databases into dataset of 2.5 billion explicit triples, which are complemented by another 2.8 billion implicit statements inferred from them." - _alf