PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 12775584-8 2003 Additionally, tyrosine phosphorylation of Vsm-RhoGEF induced by EphA4 upon ephrin-A1 stimulation enhanced the Vsm-RhoGEF activity for RhoA. Tyrosine 14-22 ras homolog family member A Homo sapiens 134-138