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. 2010 Nov 19;193(3):768–773. doi: 10.1128/JB.01196-10

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FIG. 1. — Chemotactic responses to l-serine and AI-2, demonstrated by the results of μPlug assays. The μPlug assay was carried out as described in the text and as previously reported (10, 19); the distribution of dead, RFP-labeled cells is not shown, but it was always uniform except when the dead cells were displaced around the plug by accumulating GFP-labeled motile cells. (A) Distribution of wild-type (CV1) cells in the absence of any attractant in the plug. (B) Distribution of wild-type (CV1) cells with 200 μM l-serine in the plug. (C) Distribution of wild-type (CV1) cells with 200 μM AI-2 in the plug. (D) Distribution of Δtsr (CV5) cells with 200 μM l-serine in the plug. (E) Distribution of Δtsr (CV5) cells with 200 μM AI-2 in the plug. (F) Distribution of lsrBΩKan^r (MJ101) cells with 200 μM l-serine in the plug. (G) Distribution of lsrBΩKan^r (MJ101) cells with 200 μM AI-2 in the plug. (H) Distribution of lsrCΩKan^r (MJ102) cells with 200 μM AI-2 in the plug.