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The level of [14C]MA accumulation was measured 5 s after addition of the substrate. [14C]MA (20 μM) was used with ammonium (0.01 μM to 2000 μM) added at zero time. ET8004 (glnA−) (□), GT1000 (glnK− amtB−) (△). Results are means±S.D. (n=4).
