Immunogen sequence: IVTYTCDPDP EEGVNFILIG ESTLRCTVDS QKTGTWSGPA PRCELSTSAV QCPHPQILRG RMVSGQKDRY TYNDTVIFAC MFGFTLKGSK QIRCNAQGTW EPSAPVCEKE CQAPPNILNG QKEDRHMVRF DPGTSIKYSC NPGYVLVGEE SIQCTSEGVW TPPVPQCKVA ACEATGRQLL TKPQHQFVRP DVNSSCGEGY KLSGSVYQEC QGT