Immunogen sequence: MADDAGAAGG PGGPGGPGMG NRGGFRGGFG SGIRGRGRGR GRGRGRGRGA RGGKAEDKEW MPVTKLGRLV KDMKIKSLEE IYLFSLPIKE SEIIDFFLGA SLKDEVLKIM PVQKQTRAGQ RTRFKAFVAI GDYNGHVGLG VKCSKEVATA IRGAIILAKL SIVPVRRGYW GNKIGKPHTV PCKVTGRCGS VLVRLIPAPR GTGIVSAPVP KKL