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Types of physical interaction of C. elegans with bacteria (other than food). (A) Scanning electron microscopy picture of C. elegans covered with Leucobacter celer CBX151. Bar, 10 μm. (B–D) Nomarski pictures of unidentified bacteria with their wild C. elegans associate: adhering to the vulva of C. elegans (B), proliferating in the intestinal lumen of a L4 larva (C), and adhering to the apical intestinal border (D). Bar, 10 µm. Pictures by M.-A.F.
