. "4-Aminopyrimidin-2(1H)-one" . "cytosine (C)" . . "CC" . . . . . . . . . . "cytosine triphosphate" . . "'''c'''ytosine" . . . . . "Cytosine" . "cytosine residues" . . "Cytosine" . . "C" . "cytosine" . "'''C'''ytosine" . "cytosines" . . "''C''ytosine" . . "4-Amino-1H-pyrimidine-2-one" . . . . "C5" . "c" . "polycytosine" . . . . . . .