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AI-2 modulates flagellar morphogenesis. Representative flagella, as visualized by TEM, are shown for each of the genotypes indicated grown in normal medium (A to C, E, F, I, J, M, and N) or for 4 h in the presence of 0.1 mM DPD (G, K, and O). In all cells with flagella, the base is marked by an arrow, and the tip is marked by an arrowhead. Scale bars, 1 μm. The flagellar morphologies were scored for at least 100 cells for each treatment group (D, H, L, and P).
