Immunogen sequence: MAKAKKVGAR RKASGAPAGA RGGPAKANSN PFEVKVNRQK FQILGRKTRH DVGLPGVSRA RALRKRTQTL LKEYKERDKS NVFRDKRFGE YNSNMSPEEK MMKRFALEQQ RHHEKKSIYN LNEDEELTHY GQSLADIEKH NDIVDSDSDA EDRGTLSAEL TAAHFGGGGG LLHKKTQQEG EEREKPKSRK ELIEELIAKS KQEKRERQAQ RED