<p> This family represents the homodimeric form of cytidine deaminase, a zinc metalloprotein found in <taxon tax_id="562">Escherichia coli</taxon> [<cite idref="PUB00009543"/>] and in <taxon tax_id="3702">Arabidopsis thaliana</taxon> (Mouse-ear cress). A related, homotetrameric form with a much smaller subunit is found most bacteria and in animals, <db_xref db="INTERPRO" dbkey="IPR006262"/>. Both types may act on deoxycytidine as well as cytidine. </p> Cytidine deaminase, homodimeric