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A fragment of the nifH gene was amplified from anaerobic microbial enrichments initiated with marine planktonic invertebrates, including copepods and euphausids. A number of the nifH sequences from these enrichments were phylogenetically related to Cluster III nifH sequences of Clostridium pasteurianum and Desulfovibrio gigas. nifH fragments were cloned and sequenced from strains of Desulfobacter...
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