Fig. 1From: Amyloid precursor protein, lipofuscin accumulation and expression of autophagy markers in aged bovine brain a Lipofuscin storage, hippocampus, dentate gyrus. Pyramidal neurons showing an abundant granular, PAS positive, intracytoplasmatic storage material. Periodic acid-Schiff (PAS) stain, 40X. b Intraneuronal storage material exhibits green-yellow autofluorescence by fluorescence microscopy. Fluorescence microscope; FITC filter (excitation, 455–500 nm; emission, 500–570 nm), 40X. c Neurons of young controls does not exhibit PAS positive and intracytoplasmatic storage material. Periodic acid-Schiff (PAS) stain, 40XBack to article page