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Percent of Sprague Dawley rats (n=6/group: 3, 6, and 12 months old) showing a positive corneal reflex when evaluated at selected time points (5, 15, 30, and 45 min, and 1, 1.5, and 2 h) following intraperitoneal administration of 125 mg/kg of ketamine and 10 mg/kg xylazine.
