Immunogen sequence: MDGAVMEGPL FLQSQRFGTK RWRKTWAVLY PASPHGVARL EFFDHKGSSS GGGRGSSRRL DCKVIRLAEC VSVAPVTVET PPEPGATAFR LDTAQRSHLL AADAPSSAAW VQTLCRNAFP KGSWTLAPTD NPPKLSALEM LENSLYSPTW EGSQFWVTVQ RTEAAERCGL HGSYVLRVEA ERLTLLTVGA QSQILEPLLS WPYTLLRRYG RDK