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143.3 g guanidine HCl
25 ml Na2HPO4/NaH2PO4 (1 M)
2.5 ml imidazole (1 M)
Adjust pH to 8.0 with NaOH, and bring the final volume to 250 ml with H2O. The final concentrations should be 6 M guanidine HCl, 0.1 M Na2HPO4/NaH2PO4, and 10 mM imidazole.
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