Immunogen sequence: AHLTKDYTVR GLLGKATDDF REDGRLVEKT TYDHVTREKL DRILAVIQGS HQKALVMYSN LDLKTQEAYE MAVRGLIRPM NKSPMLITGI RCLYFAPPEF LLEVQCMHET QKELRKLVHE IGLELKTTAV CTQVRRTRDG FFTLDSALLR TQWDLTNIQD AIRAATPQVA AELEKSLSPG LDTKQLPSPG WSWDSQGPSS TLGLERGAGQ; Po