Immunogen sequence: MASGTTTTAV KIGIIGGTGL DDPEILEGRT EKYVDTPFGK PSDALILGKI KNVDCVLLAR HGRQHTIMPS KVNYQANIWA LKEEGCTHVI VTTACGSLRE EIQPGDIVII DQFIDRTTMR PQSFYDGSHS CARGVCHIPM AEPFCPKTRE VLIETAKKLG LRCHSKGTMV TIEGPRFSSR AESFMFRTWG ADVINMTTVP EVVLAKEAGI CYA