Fig. 5From: Optical and electron microscopy study of laser-based intracellular molecule delivery using peptide-conjugated photodispersible gold nanoparticle agglomeratesVisualization of calcein uptake and release. Calcein was co-incubated with CPP-AuNPs and cells for 4 h. The cell within the dotted box was irradiated. Brightfield images show no change of cell morphology after irradiation (d) compared to before (a). b Fluorescent image of cell before irradiation exhibits clear fluorescent spots. c After irradiation some of these spots are still visible, but calcein was released and spread all over the cytoplasm. Scale bars: 20 µmBack to article page