ID 3.5.4.1 DE cytosine deaminase. AN Cytosine aminohydrolase. CA cytosine + H(+) + H2O = NH4(+) + uracil. CC -!- Also acts on 5-methylcytosine. DR P25524, CODA_ECOLI ; P78594, FCA1_CANAL ; Q12178, FCY1_YEAST ; DR O59834, FCYS_SCHPO ; //