Immunogen sequence: MTMMAHQYPS WIFINEKTFI TREQLNSLLK TYNIFYENQK NLHILYGETE DGKLIVEGML DIFWGVKRPI QLKIQDEKPF SSFTSMKSSD VFSSKGMTRW GEFDDLYRIS ELDRTQIPMS EKRNSQEDYL SYHSNTLKPH AKDEPDSPVL YRTMSEAALV RKRMKPLMMD RKERQKNRAS INGHFYNHEI ENSPQDFALH IIFATGEQRR LKK