This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in cyclic amidines. The systematic name of this enzyme class is cytidine/2'-deoxycytidine aminohydrolase. This enzyme participates in pyrimidine metabolism. As every deoxycytidine deaminase is also a cytidine deaminase, they share the same EC number. The recommended name assigned by the IUBMB is cytidine deaminase.