Fig 2.

Lectin staining of a biofilm-associated polysaccharide matrix surrounding a cluster of Sodalis cells. (A) A cross section of the tsetse gut tissue stained with a rhodamine-labeled oligonucleotide specific for Sodalis 16S rRNA. (B) A WGA lectin probe (green) bound to an extracellular polysaccharide matrix. (C) Panels A and B merged. The presence of a polysaccharide matrix surrounding a Sodalis cluster in the lumen of the tsetse gut indicates that these bacterial cells have formed a biofilm. Bars, 50 μm.