Figure 4From: Phylogenetic and functional diversity of metagenomic libraries of phenol degrading sludge from petroleum refinery wastewater treatment systemClassification of the 16S rRNA gene sequences of metagenomic library of phenol degrading sludge from membrane bioreactor using the RDP database. (a) Phylum, (b) Class, (c) Order and (d) Genus. Sequences that were not classified at the Phylum level were excluded.Back to article page