Immunogen sequence: VGYGSYDFMK QSRGMLLLYS LKNPSFPEYM FSSNSGVMCL DIHVDHPYLV AVGHYDGNVA IYNLKKPHSQ PSFCSSAKSG KHSDPVWQVK WQKDDMDQNL NFFSVSSDGR IVSWTLVKRK LVHIDVIKLK VEGSTTEVPE GLQLHPVGCG TAFDFHKEID YMFLVGTEEG KIYKCSKSYS SQFLDTYDAH NMSVDTVSWN PYHTKVFMSC SSD