FIG. 3.

Neighbor-joining tree constructed with Jukes-Cantor corrected distances by using a 612-bp fragment of the DNA-dependent RNA polymerase (rpoC1) gene sequence of different Synechococcus-like isolates. Bootstrap values based on 100 replicates are shown at each node. Scale bar = 0.1 nucleotide substitution per site. The values in boxes are PUB/PEB fluorescence ratios. Asterisks indicate strains whose sequences were obtained from reference 26.