Transgenic mice overexpressing mouse activation-induced deaminase (AID) or rabbit apolipoprotein B mRNA-editing enzyme catalytic polypeptide 1 (APOBEC1), two other members of the AID/APOBEC family of cytidine deaminases, developed neoplastic diseases and showed evidence of significant editing of various expressed genes [55], [56]. Here, APOBEC1 is linked to neoplasm.