. "Catalysis of the reaction: 2-C-methyl-D-erythritol 4-phosphate + CTP = 4-CDP-2-C-methyl-D-erythritol + diphosphate." . . "4-diphosphocytidyl-2C-methyl-D-erythritol synthase activity" . "2-C-methyl-D-erythritol 4-phosphate cytidylyltransferase activity" . "4-diphosphocytidyl-2-C-methyl-D-erythritol synthase activity" . "CTP:2-C-methyl-D-erythritol 4-phosphate cytidylyltransferase activity" . "MCT activity" . "MEP cytidylyltransferase activity" . . . .