DNA fragments prepared by the digestion of purified lambda DNA with the restriction endonuclease EcoR I. On agarose gel electrophoresis the mixture separates into six individual bands having the following number of base pairs: 21226, 7421, 5804, 4878, 5643 and 3530. A solution in 10 mM Tris-HCl, pH 8.0, with 1 mM EDTA.
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