Immunogen sequence: NLRVTKKGIR LEGISEFLLP LYVKEIHSRK DSPLVLQSDR NVTVNARNHM GQLTGQLTIG ADAVEAQCKR FEVRASEDGR VLFSADEDEI TIGAEKLKVT GTEGAVFGHS VETPHIRAEP SQDLRLESPT RSLIMEAPRG VQVSAAAGDF KATCRKELHL QSTEGEIFLN AETIKLGNLP TGSFSSSSPS SSSSRQTVYE LCVCPNGKLY LSP