Immunogen sequence: MASQEFEVEA IVDKRQDKNG NTQYLVRWKG YDKQDDTWEP EQHLMNCEKC VHDFNRRQTE KQKKLTWTTT SRIFSNNARR RTSRSTKANY SKNSPKTPVT DKHHRSKNRK LFAASKNVRR KAASILSDTK NMEIINSTIE TLAPDSPFDH KTVSGFQKLE KLDPIAADQQ DTVVFKVTEG KLLRDPLSRP GAEQTGIQNK TQIHPLMSQM; Po