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Colonies of A. actinomycetemcomitans strain D7S-SA transformed with pTc-USS carrying the wild-type flp promoter DNA. Colonies were 5 days old and ∼1 mm in size. The picture was taken under a light microscope with a 4× objective. Left, wild-type-like rough colony; right, chimeric colony, in which the smooth portion appeared after 3 days of culture.
