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DGGE analysis of amoA gene sequences derived from Sourhope grassland soil sites and ammonia-oxidizing bacteria pure cultures. B6, Nitrosospira sp. strain B6; 40KI,Nitrosospira sp. strain 40KI; NpAV, Nitrosospira sp. strain NpAV; eut, N. eutropha; eur, N. europaea. Arrows represent bands excised for sequence and phylogenetic analysis.
