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Fluorescent staining of a biofilm. Colour allocation: Nucleic acid stain (SybrGreen) = green; lectin stain (AAL-Alexa568) = red; autofluorescence of algae (chlorophyll A) = blue; autofluoresence of cyanobacteria = purple/white. Image dimensions: 246 × 246 μm (from [34], with permission, source: [35]).
