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Relative abundances of the N cycle functional gene sequences detected in the anaerobic granular sludge samples (UASB-M and UASB-L). The numbers of total sequence reads were 41,059 and 60,333 for UASB-L and UASB-M, respectively. OTUs determined based on 95% sequence similarity are shown in different colors. See Table S4 in the supplemental material for detail information for each OTU. ND, not detected.
