Immunogen sequence: LPKSALFSES QKAVELGDEL QIDAIDDQKC DILVQEELLA SPKKLLEDTL FPSSKKLKKD NQESSDAELS SSEYIKTDLD AMDIKGQESS SDQEQVDVES IDFSKENKMD MTSPEQSRNV LQFTEEKEAF ISEEEIAKYM KRGKGKYYCK ICCCRAMKKG AVLHHLVNKH NVHSPYKCTI CGKAFLLESL LKNHVAAHGQ SLLKCPRCNF ESN