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Relative abundances of the cnorB transcript sequences obtained from the nitrification-denitrification granules as measured by using the NiCE chip (A) and 454 pyrosequencing done with a conventional library preparation protocol (10) (B). Four major OTUs determined based on 95% sequence similarity are shown in different patterns. ■, 2A_63087 (Nitrosomonas-related norB); ▨, 7A_78700; 
, 7A_13064; □, 3B_67163; 
, other OTUs. Phylogenetic positions of these OTUs were previously reported (10).
