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Distribution of different quinone homologs in EBPR sludges and assignment of these quinones to their possible sources (phylogenetic groups of bacteria). Symbols: ○, average data for the plant EBPR sludges with high phosphate contents (P-AO1, P-AO2, and P-AO3); ▪, data for the laboratory EBPR sludge fed with synthetic sewage (L-AO/SS). Cb, cyanobacteria; F/C, Flavobacterium-Cytophaga cluster in the Cytophaga-Bacteroides phylum. Pm, Planctomyces.
