Immunogen sequence: MSSVQQQPPP PRRVTNVGSL LLTPQENESL FTFLGKKCVT MSSAVVQLYA ADRNCMWSKK CSGVACLVKD NPQRSYFLRI FDIKDGKLLW EQELYNNFVY NSPRGYFHTF AGDTCQVALN FANEEEAKKF RKAVTDLLGR RQRKSEKRRD PPNGPNLPMA TVDIKNPEIT TNRFYGPQVN NISHTKEKKK GKAKKKRLTK ADIGTPSNFQ HIG