Ninety-six Swiss-Webster mice ( 30-35 g , 6-8 wk ) , were randomized into 6 groups 1 ) saline ( control ) , 2 ) NTG immediately after learning , 3 ) NTG 3 h after learning , 4 ) NTG and NIMO , 5 ) vehicle , and 6 ) NIMO alone .
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