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MK-801-induced stereotypy in the aged and the young mice. MK-801-induced stereotypy was scored for the first 2 min out of each 10-min time segment, and is shown as the cumulative time (in sec). The dose of MK-801 (mg/kg) is indicated for each symbol, with filled symbols and solid lines for the aged mice, and corresponding open symbols and dotted lines for the young mice.
