Immunogen sequence: MSSSLGKEKD SKEKDPKVPS AKEREKEAKA SGGFGKESKE KEPKTKGKDA KDGKKDSSAA QPGVAFSVDN TIKRPNPAPG TRKKSSNAEV IKELNKCREE NSMRLDLSKR SIHILPSSIK ELTQLTELYL YSNKLQSLPA EVGCLVNLMT LALSENSLTS LPDSLDNLKK LRMLDLRHNK LREIPSVVYR LDSLTTLYLR FNRITTVEKD IKN