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Effects of PM2.5 exposure on pathological changes. (a,b) PM2.5 exposure resulted in the degenerating neurons (no visible nucleolus) (arrowhead) in CA1 region; (c,d) The unfiltered mice showed the nuclear condensation and pyknosis in CA3 region; (e,f) The granule cells of DG region was decreased after PM2.5 exposure.
