Immunogen sequence: GGAADNTLPN ELHCYDVDFQ TWEVVQPSSD SEVGGAEVPE RACASEEVPT LTYEERVGFK KSRDVFGLDF GTTSAKQPTQ PASELPSGRL FHAAAVISDA MYIFGGTVDN NIRSGEMYRF QFSCYPKCTL HEDYGRLWES RQFCDVEFVL GEKEECVQGH VAIVTARSRW LRRKITQARE RLAQKLEQEA APVPREAPGV AAGGARPPLL HVA