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DGGE of 16S rDNA fragments from cultured cells and from Mono Lake DNA extracts from the following standard DNAs (A) and sample numbers (B). (A) Lanes: 1, N. europaea; 2, N. marina; 3, an equal mixture of N. europaea and N. marina; 4, sample 4.15; 5, sample 7.14; 6, sample 7.15; 7, sample 7.18; 8, Nitrosospira briensis. (B) Lanes: 1, N. europaea; 2, sample 4.2; 3, sample 4.3; 4, sample 4.5; 5, sample 4.8; 6, 4.11; 7, sample 4.7; 8, N. briensis.
