Immunogen sequence: AREQREKEER ERREQEELER QKREELAQRV AEERTTRREE ESRRLEAEQA REKEEQLQRQ AEERALRERE EAERAQRQKE EEARVREEAE RVRQEREKHF QREEQERLER KKRLEEIMKR TRRTEATDKK TSDQRNGDIA KGALTGGTEV SALPCTTNAP GNGKPVGSPH VVTSHQSKVT VESTPDLEKQ PNENGVSVQN ENFEEIINLP IGS