Immunogen sequence: SSQMWLQLSQ SLKGWDHMFT VDFWTIMENH NHSKESHTLQ VILGCEMQED NSTEGYWKYG YDGQDHLEFC PDTLDWRAAE PRAWPTKLEW ERHKIRARQN RAYLERDCPA QLQQLLELGR GVLDQQVPPL VKVTHHVTSS VTTLRCRALN YYPQNITMKW LKDKQPMDAK EFEPKDVLPN GDGTYQGWIT LAVPPGEEQR YTCQVEHPGL DQP