cytidine deaminase activity Catalysis of the reaction: cytidine + H2O = uridine + NH3. EC:3.5.4.5 GO:0004126 MetaCyc:CYTIDEAM2-RXN RHEA:16072 Reactome:REACT_100555 Reactome:REACT_102821 Reactome:REACT_103670 Reactome:REACT_104831 Reactome:REACT_105043 Reactome:REACT_106971 Reactome:REACT_107871 Reactome:REACT_108941 Reactome:REACT_30951 Reactome:REACT_376 Reactome:REACT_80189 Reactome:REACT_81775 Reactome:REACT_86483 Reactome:REACT_86734 Reactome:REACT_869 Reactome:REACT_89154 Reactome:REACT_91892 Reactome:REACT_92525 Reactome:REACT_92541 Reactome:REACT_92713 Reactome:REACT_94503 Reactome:REACT_94636 Reactome:REACT_94708 cytidine aminohydrolase activity cytosine nucleoside deaminase activity molecular_function