Immunogen sequence: IRSRRSSQRA VLLVGLCDSG KTLLFVRLLT GLYRDTQTSI TDSCAVYRVN NNRGNSLTLI DLPGHESLRL QFLERFKSSA RAIVFVVDSA AFQREVKDVA EFLYQVLIDS MGLKNTPSFL IACNKQDIAM AKSAKLIQQQ LEKELNTLRV TRSAAPSTLD SSSTAPAQLG KKGKEFEFSQ LPLKVEFLEC SAKGGRGDVG SADIQDLEKW LAK