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Nicks and flaps are intermediates in various processes of DNA metabolism, including replication and repair. Photoaffinity modification was employed in studying the interaction of the replication protein A (RPA) and flap endonuclease 1 (FEN-1) with DNA duplexes similar to structures arising during long-patch base excision repair. The proteins were also tested for effect on DNA polymerase β (Polβ) interaction...
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