D-ribose 5-phosphate + CTP + H(+) = CDP-D-ribose + diphosphate
d-ribose 5-phosphate + ctp + h(+) = cdp-d-ribose + diphosphate
D-ribose 5-phosphate + CTP + H(+) = CDP-D-ribose + diphosphate
d-ribose 5-phosphate + ctp + h(+) = cdp-d-ribose + diphosphate