PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 10486569-1 1999 Three groups of Rap1-specific guanine nucleotide exchange factors including C3G, CalDAG-GEFI, and Epac/cAMP-GEFI/II have been identified to date. Guanine Nucleotides 30-48 RAP1A, member of RAS oncogene family Homo sapiens 16-20