Lysate was suspended at 10 mg/ml in 0.15 M Tris-HCl, pH 8, to which NaOH was added to 0.16 M. The sample was then incubated at 37°C for 2 h. TFA (10% solution) was added to a final concentration of 1% to stop the reaction. Samples were dried on a SpeedVac, and the dried material was suspended in water.
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