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0.2 mM EDTA
25% glycerol (v/v)
20 mM HEPES-KOH (pH 7.9)
0.42 M NaCl
1.5 mM MgCl2
Immediately before use, add:
0.5 mM DTT (dithiothreitol)
0.5 mM PMSF (phenylmethylsulfonyl fluoride)
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