preferred_name: a thymine-cytidine dinucleotide in DNA => a thymidine(6-4)cytidine in DNA
preferred_name_lc: a thymine-cytidine dinucleotide in dna => a thymidine(6-4)cytidine in dna
label: a thymine-cytidine dinucleotide in DNA => a thymidine(6-4)cytidine in DNA
label_lc: a thymine-cytidine dinucleotide in dna => a thymidine(6-4)cytidine in dna