Immunogen sequence: NKEIFCKMDY FSRFGTKCAR CGRQIYASDW VRRARGNAYH LACFACFSCK RQLSTGEEFG LVEEKVLCRI HYDTMIENLK RAAENGNGLT LEGAVPSEQD SQPKPAKRAR TSFTAEQLQV MQAQFAQDNN PDAQTLQKLA DMTGLSRRVI QVWFQNCRAR HKKHTPQHPV PPSGAPPSRL PSALSDDIHY TPFSSPERAR MVTLHGYIES QVQ