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50 mM Tris-Cl (pH 7.6)
1 mM CaCl2
0.2% Triton X-100
5 mM sodium butyrate
1X protease inhibitor cocktail for ChIP
0.5 mM phenylmethylsulfonyl fluoride (PMSF), freshly prepared
Nonidet P-40 (NP-40) can be used in place of Triton X-100.
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