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Agarose gel electrophoresis demonstrating the restriction patterns of a selection of ammonia oxidizer pure culture 16S rDNA sequences digested with EagI (lanes 1 to 4), HinfI (lanes 5 to 8), TaqI (lanes 9 to 12), or HaeIII (lanes 13 to 16). Lanes: A, Nitrosospira sp. (NV141); B, Nitrosospira sp. (Nsp.22); C, N. europaea (Nm50); D, N. eutropha (Nm57); M, MBI molecular weight marker, 21; X, 100-bp ladder (Gibco).
