Immunogen sequence: KKRPKPGGWN TGGSRYPGQG SPGGNRYPPQ GGGGWGQPHG GGWGQPHGGG WGQPHGGGWG QPHGGGWGQG GGTHSQWNKP SKPKTNMKHM AGAAAAGAVV GGLGGYMLGS AMSRPIIHFG SDYEDRYYRE NMHRYPNQVY YRPMDEYSNQ NNFVHDCVNI TIKQHTVTTT TKGENFTETD VKMMERVVEQ MCITQYERES QAYYQRGS; Posi