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50 mM sodium phosphate (pH 7.4)
0.5 M NaCl
0.5 mg/ml lysozyme
1 mM phenylmethylsulfonyl fluoride (PMSF)
1.7 units/ml Benzonase (Merck, Darmstadt, Germany)
1 mM MgCl2
Add the lysozyme, PMSF, and Benzonase just prior to use in Step 3.
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