Prolonged persistence of mutagenic DNA lesions in somatic cells - Nature
Briefly

DNA repair mechanisms must efficiently rectify a myriad of lesions to prevent mutations; yet some lesions can escape repair, persisting through several cell cycles, leading to multi-allelic variants.
The persistence of specific DNA lesions across cell divisions in mice has been linked to the generation of diverse mutations with each replication cycle, indicating a crucial area for further research.
Read at Nature
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