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Production of l-threo-β-hydroxy-Gln using whole-cell reaction. (a) Effect of initial l-Gln concentration on production efficiency. Symbols: bars, concentration of l-threo-β-hydroxy-Gln; circles, conversion ratio. (b) Time course under the optimized conditions. Symbols: circles, l-threo-β-hydroxy-Gln; squares, l-Gln; triangles, l-Glu. Data are expressed as the mean ± SD results from three independent experiments.
