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The proportions of l-glutamate and l-glutamine under different conditions. Strain YYL monoculture system at initial pH values of 7.0 (indicated by uppercase A) and pH 8.3 (indicated by C); strains YYL and MLY1 in a coculture system at initial pH values of 7.0 (indicated by B) and pH 8.3 (indicated by D). 1, 2, and 3 indicate the three time points of 60, 96, and 120 h, respectively.
