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Percentage of Au uptaken by 4T1-Luc cells (a) and cellular uptake amount of Au per cell (b) after being cultured in medium containing BSA-coated AuNRs at different Au concentration of 0.0, 0.2, 0.4 and 0.6 mM for 6 h. Data are presented as mean ± standard deviation, n = 3. No significant difference: N.S.; Significant difference: ** p < 0.01; *** p < 0.001.
