. "Catalysis of the reaction: GDP-alpha-D-mannose = GDP-4-dehydro-6-deoxy-alpha-D-mannose + H(2)O." . . "GDP-mannose 4,6-dehydratase activity" . "Gmd" . "GDP-D-mannose 4,6-dehydratase activity" . "GDP-D-mannose dehydratase activity" . "GDP-mannose 4,6-hydro-lyase (GDP-4-dehydro-6-deoxy-D-mannose-forming)" . "GDP-mannose 4,6-hydro-lyase activity" . "GDPmannose 4,6-dehydratase activity" . "guanosine 5'-diphosphate-D-mannose oxidoreductase activity" . "guanosine diphosphomannose 4,6-dehydratase activity" . "guanosine diphosphomannose oxidoreductase activity" . . .