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A) A. actinomycetemcomitans mono-species culture in CDM/sucrose at days 1/3. B) A. actinomycetemcomitans grown in the remote presence of S. mitis on days 1/3. For the assay the cells were stained with the Live/Dead dyes. Live cells are stained in green, dead cells light up in red. Magnification: 400× for every picture.
