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Differences in the size of the bclA gene in 11 different B. anthracis strains. The sequences encoding the CLR were amplified by PCR and analyzed by 2% agarose gel electrophoresis. Lane 1, strain 7702; lane 2, strain 8189; lane 3, strain 53169; lane 4, strain 9602R; lane 5, strain A2R; lane 6, strain 6183R; lane 7, strain 6602; lane 8, strain RA3R; lane 9, strain 7611R; lane 10, strain 5725R; lane 11, strain 4229. Molecular size markers (in base pairs) are indicated in the left margin.
