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Chromatograms of reaction mixtures containing 5 μM PABA/NO (6a), 0.1 mM GSH, and 2.9 nM GSTμ (molecular weight 25.7 kDa) in 0.1 M phosphate at pH 7.4 and 37 °C at (A) 2 min and (B) 35 min after mixing.