Immunogen sequence: SCLDHNSESI ILPMNVTVRD IPHWLNPTRV ERVVCTAGLK WYPHPALIHC VKGCEPFMGD NYCDAINNRA FCNYDGGDCC TSTVKTKKVT PFPMSCDLQG DCACRDPQAQ EHSRKDL. Pregnancy-associated plasma protein-A (PAPP-A, Insulin-like growth factor binding protein-4 protease, PA