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Appearance of teicoplanin-resistant staphylococci under optical microscope. Bacteria (CNS 15) were observed when grown in TSB (A and D) and when grown in the presence of 8 μg of teicoplanin per ml (B and E) and in the presence of teicoplanin after having reached stationary phase (C and F). (A, B, and C) Gram-stained bacteria. (D, E, and F) Cells observed by phase-contrast microscopy.
