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Drop-collapsing test. Ten-microliter volumes of the following bacterial cultures were placed on the lid of a petri dish. (A) Side view. (B) Top view. 0, 0.9% NaCl; wt, S. liquefaciens MG1; swrI, S. liquefaciens MG44; swrA, S. liquefaciens PL10; flhD, S. liquefaciens MG3; +BHL, strain grown in the presence of 200 nM BHL.
