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Neighbor-joining tree showing the correspondence between DGGE bands and phylogenetic relationships of SAR11 group sequences from the Arctic Ocean. Trees were constructed by using only the portion of cloned sequences interrogated by the primers used in our DGGE analysis (356f to 517r, including primer regions). The trees are unrooted, with E. coli as the out group. The bar indicates a Jukes-Cantor distance of 0.02.
