Figure 4. Graft with bullous keratopathy transplanted to a healthy recipient (Group ‘bullous graft’). The healthy peripheral host endothelium replaces the central, benzalkonium chloride (BAK)-damaged graft endothelium. Top: Green fluorescent protein/4′,6-diamidino-2-phenylindole (GFP/DAPI) staining (original magnification 1200×). Bottom: Alizarin red S staining (original magnification 100×).