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FISH hybridization of sediment taken from the surface of the C- (a) and B-series (b) sample submerged in wastewater using the specific probe DELTA495a (green) and GAM42a (red). Image of δ-Proteobacteria in the background of DAPI-stained bacteria (a) and δ-Proteobacteria and γ-Proteobacteria (b). Scale bar 10 μm.
