a thymidine dimer in DNA => a thymidine(6-4)thymidine in DNA
a thymidine dimer in dna => a thymidine(6-4)thymidine in dna
a thymidine dimer in DNA => a thymidine(6-4)thymidine in DNA
a thymidine dimer in dna => a thymidine(6-4)thymidine in dna