A member of the AID/APOBEC family of cytosine deaminases. The biological function of APOBEC4 is poorly understood. However, it is widely conserved across vertebrates [1].

1: Evolution of the deaminase fold and multiple origins of eukaryotic editing and mutagenic nucleic acid deaminases from bacterial toxin systems. Iyer LM, Zhang D, Rogozin IB, Aravind L; Nucleic Acids Res. 2011; [Epub ahead of print] PMID:21890906

2: Diversification of AID/APOBEC-like deaminases in metazoa: multiplicity of clades and widespread roles in immunity. Krishnan A, Iyer LM, Holland SJ, Boehm T, Aravind L; Proc Natl Acad Sci U S A. 2018;115:E3201. PMID:29555751