Immunogen sequence: FHYRRTGSLL PALPKLPSLS SLVKPSENGN GVTFRSGADL NMDIGVSGFG PETAIDRSMA MSEDFVMEMG KQPIIFENPM YSARDSAVKV VQPIQVTVSE NVDNKNYGSP INPSEIVPET NPTSPAADGT QVTKWNLFKR KSKQTTNFEN PIYAQMENEQ KESVAATPPP SPSLPAKPKP PSRRDPTPTY SATEDTFKDT ANLVKEDSEV; Po