Immunogen sequence: SQEAGTGAGA GSLAGSCGCG TPQRPGAHGS SAAAHRYSRE ANAPGPVPGE RQLAHSKMVP IPAGVFTMGT DDPQIKQDGE APARRVTIDA FYMDAYEVSN TEFEKFVNST GYLTEAEKFG DSFVFEGMLS EQVKTNIQQA VAAAPWWLPV KGANWRHPEG PDSTILHRPD HPVLHVSWND AVAYCTWAGK RLPTEAEWEY SCRGGLHNRL FPW