Fig. 4. (a) Staining of HepG2 cells by 1 (10 μM, 30 min) showing the cellular uptake and in cellulo luminescence of 1 with a DIC micrograph. Confocal co-localisation studies of 1 with (b) CellMask, (c) DAPI and (d) Syto9 and Propidium Iodide (PI). (e) Higher resolution micrograph of an interphase cell uptake of 1 co-stained with Syto9. (f) Higher resolution micrograph of an interphase cell uptake of 1 co-stained with DAPI. The scale bar represents 20 μm.