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Fitch-Margoliash tree of β subgroup Proteobacteria amoA sequences. The clones obtained in this work (in boldface type) are positioned in relation to cultured or environmental ammonia oxidizers (references are cited in Table 1). The tree was rooted with the pmoA sequence of Methylococcus capsulatus and the amoA sequence of Nitrosococcus oceanus, an AOB of the γ subclass of the Proteobacteria. The tree scale is in the lower left corner.
