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Negative images of denaturing gradient gels of PCR-amplified g20 gene fragments. Labeled bands were excised from the gels, cloned, and then sequenced. Bands in the same lane with the same letter beside them (a, b, or c) had >99% identical nucleotides. From within each lane, only one sequence with >99% identical nucleotides was included in further analyses. Bands with labels that have an asterisk and are shown in bold were included in the phylogenetic analysis.
