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Purified protein preparations. Protein preparations were analyzed by SDS–PAGE and Coomassie blue staining. Lane 1, molecular size marker (m, molecular mass indicated in kDa); lane 2, hMre11-his6 preparation; lane 3, hKu70-his6/hKu80 preparation; lane 4, hRad52-his6 preparation; lane 5, hRPA preparation.
