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Figure 5 Co-localization of ubiquitin (brown) with terminal deoxynucleotidyl transferase end labeling (TUNEL) positive cells (red) in lipid core area (A) and cap/shoulder region (B). Double immunofluorescence (inserted panel) more clearly visualizes ubiquitin (yellow fluorescence) in the cytoplasm of cells, which line cholesterol crystals of the lipid core and stain positive for TUNEL (red fluorescence). Original magnification for all panels 100x.