Immunogen sequence: LKGVVWYQGE SNINYNTDLY NCTFPALIED WRETFHRGSQ GQTERFFPFG LVQLSSDLSK KSSDDGFPQI RWHQTADFGY VPNPKMPNTF MAVAMDLCDR DSPFGSIHPR DKQTVAYRLH LGARALAYGE KNLTFEGPLP EKIELLAHKG LLNLTYYQQI QVQKKDNKIF EISCCSDHRC K. This gene encodes an enzyme which