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Immunofluorescence images of neurons labeled with MAP-2 (Left) and propidium iodide (Center) to show apoptosis of neurons (Right, superimposed images) in mixed neuronal/glial cultures after overnight exposure to 200 pM gp120. After propidium iodide labeling, apoptotic neurons appear small, round, and intensely fluorescent (indicated with white arrows in the Center image).
