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Activity of the glnA promoter in milk. Luciferase activity (circles) and pH (triangles) were measured during growth of strain TIL521 (glnA::luxAB, GS+) in milk (open symbols) or in milk supplemented with 10 mM glutamine (filled symbols) at 30°C. The level of luciferase activity in M17Lac was 75 ± 25 ULU/OD. The OD measurements are identical under both conditions; for clarity, they are not presented.
