Immunogen sequence: YRYTGSLTTP PCSEIVEWIV FRRPVPISYH QLEAFYSIFT TEQQDHVKSV EYLRNNFRPQ QRLHDRVVSK SAVRDSWNHD MTDFLENPLG TEASKVCSSP PIHMKVQPLN QTALQVSWSQ PETIYHPPIM NYMISYSWTK NEDEKEKTFT KDSDKDLKAT ISHVSPDSLY LFRVQAVCRN DMRSDFSQTM LFQANTTRIF Q; Positive Sa