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TEM analyses of the daptomycin-susceptible parental strain (616), the vancomycin-exposed but daptomycin-unexposed strain (621), and the two daptomycin-resistant strains (701 and 703). The thickness of cell walls (in nanometers) was measured at ×190,000 magnification. Data (± SD) for strains 616, 701, and 703 have been recently published (37).
