Immunogen sequence: ARPTKKKTTQ DSTDLVDNMS PEEIEAWEQE QLSQPVCFDS CCIDQSPFQL VEQTTLHKTH TLFSLLGLHL AYVTSMGKLR GVLALEELQK AIEGHTKSGV QLRPPLASFR NTTSTRKSTG APPSSAENWN LPEDRPGATG TGDVIAASPE TPVPSPSPEP PLSLAPGKVE GELEELELVE SPGLEEELAD ILQGPSLRST DEEDEDELIL. Th