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cytidine deaminase, homotetrameric This small, homotetrameric zinc metalloprotein is found in humans and most bacteria. A related, homodimeric form with a much larger subunit is found in E. coli and in Arabidopsis. Both types may act on deoxycytidine as well as cytidine. [Purines, pyrimidines, nucleosides, and nucleotides, Salvage of nucleosides and nucleotides]
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