Immunogen sequence: TALLKCKATG DPLPVISWLK EGFTFPGRDP RATIQEQGTL QIKNLRISDT GTYTCVATSS SGETSWSAVL DVTESGATIS KNYDLSDLPG PPSKPQVTDV TKNSVTLSWQ PGTPGTLPAS AYIIEAFSQS VSNSWQTVAN HVKTTLYTVR GLRPNTIYLF MVRAINPQGL SDPSPMSDPV RTQDISPPAQ GVDHRQVQKE LGDVLVRLHN P;