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TEM of unstained HEK treated with 42.5μg/ml of C60(OH)x for 24h. (a) Untreated control. (b) C60(OH)20. (c) C60(OH)24. (d) C60(OH)32. Large arrows denote fullerenol agglomerates in cytoplasmic vacuoles and small arrows show fullerenols attached to the cell membrane.
