PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2536701-6 1989 Residues 49, 50, and 51 in IGF I are Phe-Arg-Ser and are strictly conserved in IGF II. Serine 45-48 insulin like growth factor 2 Homo sapiens 79-85