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Composition of the biofilm and sediment communities based on 16S rRNA gene libraries (A and B), 16S rRNA transcripts from the metatranscriptome (C), and expressed universal marker genes (44) in the metatranscriptome (D). The 16S rRNA gene libraries were generated from the white biofilm only, with bacterium-specific primers (A), and postincubation biofilm and sediment, with universal primers (B). The two “Ca. Thiopilula” transcripts in Fig. 2 represent 3.3% of the community in panel C.
