PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15286999-5 2004 One of these alleles, SosM98, which contains a single amino acid substitution in the RacGEF motif, functions as a dominant negative in vivo to downregulate RTK signaling. sosm98 22-28 ret proto-oncogene Homo sapiens 156-159