A Putative Efflux Transporter of the ABC Family, YbhFSR, in <i>Escherichia coli</i> Functions in Tetracycline Efflux and Na⁺(Li⁺)/H⁺ Transport.

Subsequently, we added tetracycline at 100 μg/ml to different cultures for 5 min and then tested the inhibition of tetracycline efflux by adding 1.0 mM ortho -vanadate or 40 μm CCCP, which showed a highly significant decrease in fluorescence.

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