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16S rRNA gene copy numbers of Methanobacterium and Methanobrevibacter in reactors EX_OL37 (3:1 excreta/TPOMW at 37°C), EX_OL55 (3:1 excreta/TPOMW at 55°C), EX37 (3:1 excreta/water at 37°C), and OL37 (3:1 water/TPOMW at 37°C). Bars represent standard errors (n = 3).
