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Rooted neighbor-joining (NJ) trees based on nucleotide sequences. (A) Tree constructed by using genomic sequences encoding cytochrome b (cob) of dinoflagellates and other organisms. (B) Tree constructed by using 18S rRNA of dinoflagellates and other organisms. Scale bars = 0.1 nucleotide substitution per site. The circled numbers are bootstrap confidence values based on 1,000 replicates. The numbers in parentheses are accession numbers.
