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. 2015 Jul 7;6:694. doi: 10.3389/fmicb.2015.00694

Figure 2.

Figure 2

Relative abundance of archaeal OTUs defined using the 16S rRNA gene hyper-variable region V3V4. The bar chart shows the diversity of Archaea at the lowest reliable taxonomic level (where possible the default family is denoted in the key). AD, agricultural biogas plant anaerobic digester; WD, wastewater treatment plant anaerobic digester.