Fluorescent micrographs of AO/PI double stained HeLa cells that were treated with were 4.75 ± 1.23 μg/mL SG-stabilized AuNPs; (a) Untreated cells showing normal cell structures; (b) Treated cells after 24 h incubation showing membrane blebbing and chromatin condensation; (c) Membrane blebbing, chromatin condensation and nuclear margination with early apoptotic cells after 48 h treatment; (d) Membrane blebbing, chromatin condensation and apoptotic body formation with numerous late apoptotic cells after 72 h treatment. VC: Viable cells, EA: Early apoptotic cells, CC: Chromatin condensation, BL: Membrane blebbing, MN: Marginated nucleus, LA: Late apoptotic cells, and AB: Apoptotic body (400× magnification).