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PFGE analysis of genomic DNA from a clinical isolate (sample in lane 1) and environmental isolates (samples in lanes 2 to 10) from the epidemic. The samples in lanes 11 and 12 were unrelated environmental and clinical strains, respectively, and the sample in lane 13 was the L. pneumophila ATCC 33152 type strain. Lanes M, molecular weight marker (S. cerevisiae).
