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CRA plate test. (A) Red colonies of the non-slime-producing S. epidermidis reference strain ATCC 12228. (B) Black colonies of the slime-producing S. epidermidis reference strain ATCC 35984 (RP62A). (C) Black colonies of S. epidermidis strain 13, which exhibited a red central zone at 48 h, indicating the onset of a non-slime-producing phase variant.
