label: a 2'-deoxyuridine in single-stranded DNA + NH4(+) => a 2'-deoxycytidine in single-stranded DNA + H2O + H(+)
label_lc: a 2'-deoxyuridine in single-stranded dna + nh4(+) => a 2'-deoxycytidine in single-stranded dna + h2o + h(+)