Fig. 1From: Horseradish Peroxidase-Encapsulated Hollow Silica Nanospheres for Intracellular Sensing of Reactive Oxygen SpeciesTEM images of a hollow silica nanospheres (HSNs), b HSNs stained with uranyl acetate, c horseradish peroxidase-encapsulated HSNs (HRP@HSNs), and d HRP@HSNs stained with uranyl acetate. Inset: an enlarged viewBack to article page