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Biofilm bacteria with crevasses (A) and ridges (B) between cells. Surface plots of AFM height images emphasized surface corrugations. Z (height) scales are 250 (A) and 150 (B) nm/division. Unsaturated P. putida mt-2 biofilms were unwashed, desiccated, and 4 (A) or 3 (B) days old before AFM imaging.
