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(A) Fe(II) and H2S concentrations in groundwater collected from Rifle sediment microcosms; (B) Methane and acetate concentrations in sediment incubations with and without addition of the eukaryotic inhibitors cycloheximide and colchicine; (C) The number of Methanomicrobiales mcrA and Metopus ß-tubulin gene copies detected in groundwater collected from sediment incubations.
