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linked. The bond length of this dimerization is shorter than the bond length of normal B-DNA structure which produces an incorrect template for replication and transcription. The more common covalent linkage involves the formation of a cyclobutane bridge. Photolyases have a high affinity for these lesions and reversibly bind and convert them back to the original bases. The photolyase-catalyzed DNA repair process by which cyclobutane pyrimidine dimers are resolved has been studied by time-resolved crystallography

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