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High magnification TEM photomicrographs—24 h. LLC-PK1 cells were treated for 24 h with 10nM mg CdSe QD (A) or 100nM InGaP QD (B). White arrows show autophagic vacuoles, consisting of double-layered membranes containing cellular debris. Black arrows show lysosomal remnants, consisting of multilamellar vacuoles and electron-dense deposits. Magnification 5000–20,000×.
