Immunogen sequence: GCFPAGAQVR LESGARVALS AVRPGDRVLA MGEDGSPTFS DVLIFLDREP HRLRAFQVIE TQDPPRRLAL TPAHLLFTAD NHTEPAARFR ATFASHVQPG QYVLVAGVPG LQPARVAAVS THVALGAYAP LTKHGTLVVE DVVASCFAAV ADHHLAQLAF WPLRLFHSLA WGSWTPGEGV HWYPQLLYRL GRLLLEEGSF HPLGMSGAGS; Po