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Effect of PCOOH‐liganded gold nanoparticles on the circularity index (A), volume (B), protein context (C), acid phosphatase activity (D), and caspase‐3/7 activity (E) of spheroids over a 72 h exposure period. Significance indicated as *p ≤ 0.05; **p ≤ 0.01; ***p ≤ 0.001 as compared to the negative control.
