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(A and B) Original archaeal groundwater community (A) and temporal changes in archaeal OTU abundance (B) from selected dates from triplicate continuous flow bioreactors of the lactate-enriched Hanford well H-100 groundwater sample. Methanosarcina OTUs are dotted, and Methanobacteria OTUs are solid. (C) Distance tree of sequence representatives from the individual archaeal clusters (97% level).
