Immunogen sequence: MPVAATNSET AMQQVLDNLG SLPSATGAAE LDLIFLRGIM ESPIVRSLAK AHERLEETKL EAVRDNNLEL VQEILRDLAH VAEQSSTAAE LAHILQEPHF QSLLETHDSV ASKTYETPPP SPGLDPTFSN QPVPPDAVRM VGIRKTAGEH LGVTFRVEGG ELVIARILHG GMVAQQGLLH VGDIIKEVNG QPVGSDPRAL QELLRNASGS VIL