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Relative abundances of methanogen-related SSU rRNA in LS reactors 1 and 2 and HS reactors 6 and 7 on day 0 determined by SSU rRNA membrane hybridization to oligonucleotide probes. The abundance of each group is expressed as a percentage of the total amount of methanogen-related SSU rRNA detected by all of the methanogen-specific probes used.
