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A. actinomycetemcomitans isolates 456A1 [1], 456A2 [2], sample 455 [3], sample 456 [4], JP2 [5], and D7s [6]. (a) Strain with a complete leukotoxin promoter region, (b) strain with a 530-bp deletion in the leukotoxin promoter region, (c) strain with a 640-bp deletion in the leukotoxin promoter region. Molecular weight marker (M).
