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STEM micrograph of cell envelope of MSSA treated with AgNPs. (1) Cytoplasm, (2) cytoplasmic membrane, (3) cell wall and (4) wall teichoic acids. (b) Schematic diagram of our hypothesis on the interaction between AgNPs and the teichoic acids of the cell wall. (WTA = wall teichoic acids; LTA = lipoteichoic acids). The AgNP concentration is 11.5 ppm.
