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Distance neighbor-joining tree of betaproteobacterial AOB AmoA sequences based on 149 amino acid residues. Database sequences for cultured strains and environmental sequences are in boldface and are identified by GenBank accession numbers. Monterey Bay sequences are labeled A (for AmoA)-month-year-depth (surface [S], mid [M])-clone number; e.g., A10-99-M-21 represents AmoA October 1999 mid-depth clone 21. Bootstrap values of >60 are displayed.
