Immunogen sequence: QNDAGVRIQF KPDDGTTPER IAQITGPPDR CQHAAEIITD LLRSVQAGNP GGPGPGGRGR GRGQGNWNMG PPGGLQEFNF IVPTGKTGLI IGKGGETIKS ISQQSGARIE LQRNPPPNAD PNMKLFTIRG TPQQIDYARQ LIEEKIGGPV NPLGPPVPHG PHGVPGPHGP PGPPGPGTPM GPYNPAPYNP GPPGPAPHGP PAPYAPQGWG NAY