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Aprotinin (1 mg/mL)
DTT (dithiothreitol; 1 mM)
Glycerol (10%)
HEPES-KOH (40 mM, pH 7.9)
KCl (50 mM)
Leupeptin (1 mg/mL)
Pepstatin A (1 mg/mL)
PMSF (phenylmethylsulfonyl fluoride; 0.2 mM)
For Type II reactions, add 0.2 mM EDTA.
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