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Micrographs of acridine orange assay of rats' hippocampi (CA1, CA3, and DG regions): C: control group; F: formaldehyde-treated group; 200: 200 mg/kg MC-treated group; 500: 500 mg/kg MC-treated group; F200: formaldehyde plus 200 mg/kg MC-treated group; F500: formaldehyde plus 500 mg/kg MC-treated group. Arrows indicate dead cells.
