PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 12451317-14 2002 The P2X4, P2Y11, P2Y1, and P2Y2 are the most expressed P2 receptors in EC, and are most likely mediating release of nitric oxide, endothelium-dependent hyperpolarizing factor (EDHF), and t-PA induced by extracellular nucleotides. edhf 176-180 purinergic receptor P2X 4 Homo sapiens 4-8