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| Pyrimidine Dimers Thymine Dimers | Cyclobutane-Pyrimidine Dimers | Cytosine-Thymine Dimers | Thymine-Cyclobutane Dimer | Thymine-Thymine Cyclobutane Dimer | Cyclobutane Dimer, Thymine-Thymine | Cyclobutane Pyrimidine Dimers | Cytosine Thymine Dimers Dimers found in DNA chains damaged by ultraviolet irradiation. They consist of two adjacent pyrimidine nucleotides, usually thymine nucleotides, in which the pyrimidine residues are covalently joined by a cyclobutane ring. These dimers stop DNA replication. |