2′-Deoxycytidine 5′-diphosphate (dCDP) has been used as a substrate for nucleotide diphosphate kinase (NDPK) to produce 2′-deoxycytidine 5′-triphosphate (dCTP) in support of DNA biosynthesis and reverse transcription. 2′-Deoxycytidine 5′-diphosphate (dCDP) has been used as a substrate for nucleotide diphosphate kinase (NDPK) to produce 2′-deoxycytidine 5′-triphosphate (dCTP) in support of DNA biosynthesis and reverse transcription.