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Phylogenetic tree showing the relationships of ammonia oxidizer isolates N. mobilis Nm93 and N. europaea Nm103 and their closest relatives among the beta subclass of Proteobacteria. The tree is based on the results of maximum-likelihood analysis. Target organisms for probes Nso190, Nso1225, Nsm156, Nsv443, NEU, S-*-Nse-1472-a-A-18, and NmV are indicated by brackets. The bar represents 10% estimated sequence divergence.
