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8 M urea
Use ultrapure urea (e.g., ICN Biomedicals). Urea solutions should be freshly deionized using analytical-grade mixed bed resin, AG 501-X8 (D) from Bio-Rad.
50 mM Tris-HCl (pH 7.4)
5 mM EGTA
0.2% 2-mercaptoethanol
1 mM phenylmethylsulfonyl fluoride (PMSF)
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