Enables cytidine deaminase activity. Acts upstream of or within cytidine to uridine editing and mRNA modification. Predicted to be active in cytoplasm and nucleus. Is expressed in several structures, including head mesenchyme; lower urogenital tract; reproductive system; urethra epithelium; and vertebral axis musculature. Orthologous to human APOBEC2 (apolipoprotein B mRNA editing enzyme catalytic subunit 2). [provided by Alliance of Genome Resources, Apr 2022]