Immunogen sequence: SQDGFPAGQE LLGYKALDPE ISSGEGLRYQ KLGDEDNWFE INQHTGDLRT LKVLDRESKF VKNNQYNISV VAVDAVGRSC TGTLVVHLDD YNDHAPQIDK EVTICQNNED FAVLKPVDPD GPENGPPFQF FLDNSASKNW NIEEKDGKTA ILRQRQNLDY NYYSVPIQIK DRHGLVATHM LTVRVCDCST PSECRMKDKS TRDVRPNVIL G;