PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 23921591-5 2013 TGF-beta-mediated GDNF signaling slightly elevated the phosphorylation state of Ret, the canonical coreceptor for the GPI-linked (glycosyl-phosphatidylinositol) GFRa1. gpi-linked (glycosyl-phosphatidylinositol 118-159 ret proto-oncogene Homo sapiens 80-83