Immunogen sequence: YNINNSVSFS SAVKCVCNLM IKEPKSSSRT LGRAPYSFTF NSQFEFGKKH KWIQIDVTSL LQPLVASNKR SIHMSINFTC MKDQLEHP Highest antigen sequence identity to the following orthologs: Mouse - 59%, Rat - 58%. GDF9 is a member of the bone morphogenetic protein