Immunogen sequence: MAAAAAAGEA RRVLVYGGRG ALGSRCVQAF RARNWWVASV DVVENEEASA SIIVKMTDSF TEQADQVTAE VGKLLGEEKV DAILCVAGGW AGGNAKSKSL FKNCDLMWKQ SIWTSTISSH LATKHLKEGG LLTLAGAKAA LDGTPGMIGY GMAKGAVHQL CQSLAGKNSG MPPGAAAIAV LPVTLDTPMN RKSMPEADFS SWTPLEFLVE TFH