a cytidine dimer in DNA + H(+) => a cytidine(6-4)cytidine in DNA
a cytidine dimer in dna + h(+) => a cytidine(6-4)cytidine in dna
a cytidine dimer in DNA + H(+) => a cytidine(6-4)cytidine in DNA
a cytidine dimer in dna + h(+) => a cytidine(6-4)cytidine in dna