Immunogen sequence: RYVFDISALE KDGLLGAELR ILRKKPSDTA KPAAPGGGRA AQLKLSSCPS GRQPASLLDV RSVPGLDGSG WEVFDIWKLF RNFKNSAQLC LELEAWERGR AVDL Highest antigen sequence identity to the following orthologs: Mouse - 93%, Rat - 93%. GDF-5 is expressed in long bones