Immunogen sequence: MGSKKLKRVG LSQELCDRLS RHQILTCQDF LCLSPLELMK VTGLSYRGVH ELLCMVSRAC APKMQTAYGI KAQRSADFSP AFLSTTLSAL DEALHGGVAC GSLTEITGPP GCGKTQFCIM MSILATLPTN MGGLEGAVVY IDTESAFSAE RLVEIAESRF PRYFNTEEKL LLTSSKVHLY RELTCDEVLQ RIESLEEEII SKGIKLVILD SVA