Anti-cytidine deaminase antibodies are used in the immunodetection of the protein encoded by the CDA gene. In humans, the canonical protein has a reported length of 146 amino acid residues and a mass of 16.2 kDa. It is reported to be highly expressed in granulocytes while expression is very low in fibroblasts, chondrocytes, monocytes, and T- as well as B-cell lines. A member of the Cytidine and deoxycytidylate deaminase protein family, it is known to scavenge exogenous and endogenous cytidine and 2'-deoxycytidine for UMP synthesis. Other names for this target antigen include cytidine aminohydrolase, cytosine nucleoside deaminase, small cytidine deaminase, and CDD.