a thymidine(6-4)cytidine in DNA = a thymine-cytidine dinucleotide in DNA
a thymidine(6-4)cytidine in dna = a thymine-cytidine dinucleotide in dna
a thymidine(6-4)cytidine in DNA = a thymine-cytidine dinucleotide in DNA
a thymidine(6-4)cytidine in dna = a thymine-cytidine dinucleotide in dna