Fig. 7. Compound 6k induced apoptosis in A549 cells was studied by AO/EB staining and photographed via fluorescence microscopy. A549 cells were treated with 6k (5, 10 and 20 μM, for 24 h), and incubated with AO/EB. Images were acquired using a Nikon Te2000 deconvolution microscope (magnification 200×).