Immunogen sequence: MPPKKQAQAG GSKKAEQKKK EKIIEDKTFG LKNKKGAKQQ KFIKAVTHQV KFGQQNPRQV AQSEAEKKLK KDDKKKELQE LNELFKPVVA AQKISKGADP KSVVCAFFKQ GQCTKGDKCK FSHDLTLERK CEKRSVYIDA RDEELEKDTM DNWDEKKLEE VVNKKHGEAE KKKPKTQIVC KHFLEAIENN KYGWFWVCPG GGDICMYRHA LPP