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Rescuing of the exonuclease activity of the internal deletion mutants SL(DEL1289–1298) and SL(DEL1299–1308) by adding the 21-aa peptide derived from the C-terminal of DP2Pho. The exonuclease activities with different combinations of proteins, metal ions and peptides were measured. The substrate used was the 84/25mer dsDNA and the ion concentration was 10 mM. All reactions were performed for 60 min. The number 400 is the molar ratio between the peptide added and the enzyme.
