Abstract
When male strains of Escherichia coli are irradiated with 254 nm ultraviolet (UV) light and mated with suitable females, DNA is transferred at almost the normal frequency (Howard‐Flanders et al., 1968). Cole (1971) observed that an episome damaged by UV irradiation of the male parent could be transferred to a recipient and restored to activity by administering photoreactivating light. He therefore deduced that UV lesions are transferred to the recipients during bacterial conjugation. The object of this Research Note is to report experiments providing direct evidence of the transfer of pyrimidine dimers ‐the main lesions of UV irradiation.
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