Immunogen sequence: FSLEENKKSK GRRQPLSKLP RHHPLVLQEC VSDDETSEQL TPEEEAEETE AWAKPLSQLW QNRPPNFEAE KEFNETMAQQ APHCAVCMIF QTYHQVEFGG FNQNCGNASD LAPQKQRTKP LIPEMCFTST GCSTDINLST PYLEEDGTSI LVSCKKCSVR VHASCYGVPP AKASEDWMCS RCSANALEED CCLCSLRGGA LQRANDDRWV HVS