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