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Pulsed-field gel electrophoresis of SmaI-digested total DNA from selected S. aureus isolates. The 29 PFGE patterns were assigned to six major lineage groups, designated by the letters A through F, and individual patterns within these lineages were numbered. The dendrogram shows estimates of genetic relatedness of the PFGE types. The PFGE pattern of standard S. aureus strain NCTC 8325 is shown unlinked in the dendrogram.
