Immunogen sequence: KDPAFTALLT TQLQVQREIV NKHNELRKAV SPPASNMLKM EWSREVTTNA QRWANKCTLQ HSDPEDRKTS TRCGENLYMS SDPTSWSSAI QSWYDEILDF VYGVGPKSPN AVVGHYTQLV WYSTYQVGCG IAYCPNQDSL KYYYVCQYCP AGNNMNRKNT PYQQGTPCAG CPDDCDKGLC TNSCQYQDLL SNCDSLKNTA GCEHELLKEK CKA