Immunogen sequence: PPPRPKTPEI FRALEGEAHR VLFGFVPETK EELQVMPGNI VFVLKKGNDN WATVMFNGQK GLVPCNYLEP VELRIHPQQQ PQEESSPQSD IPAPPSSKAP GRPQLSPGQK QKEEPKEVKL SVPMPYTLKV HYKYTVVMKT QPGLPYSQVR DMVSKKLELR LEHTKLSYRP RDSNELVPLS EDSMKDAWGQ VKNYCLTLWC ENTVGDQGFP DEP