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TEM images depicting the intracellular trafficking of different NMBGs at the concentration of 50 μg/mL in MC3T3-E1 cells after 24 h incubation. (a) Group-61 nm, (b) Group-174 nm, (c) Group-327 nm, (d) Group-484 nm, (e) Group-647 nm, (f) Group-743 nm, (g) Group-990 nm, (h) Group-1085 nm.
