Shows a cytidine deaminase activity on 2'-deoxycytidine (in vitro), however shows no RNA editing activity (in vitro). Expressed in smal intestine, colon and lung. Although in PubMed:9792440 a cytidine deaminase activity has been shown in vitro, it would be the first time that a member of this family that contains a fibrinogen C-terminal domain signature shows an enzymatic activity. And it is surprising that this protein that shows an in vitro cytidine deaminase activity does not have the cytidine and deoxycytidylate deaminases domain signature.