Immunogen sequence: MLVGSQSFSP GGPNGIIRSQ SFAGFSGLQE RRSRCNSFIE NSSALKKPQA KLKKMHNLGH KNNNPPKEPQ PKRVEEVYRA LKNGLDEYLE VHQTELDKLT AQLKDMKRNS RLGVLYDLDK QIKTIERYMR RLEFHISKVD ELYEAYCIQR RLQDGASKMK QAFATSPASK AARESLTEIN RSFKEYTENM CTIEVELENL LGEFSIKMKG; Po