| Type | MGI:General | Description | memory retention is impaired in Morris water maze; mutants spend less time searching in target quadrant after removal of platform in probe trials on days 3 and 4 of training; after 1 additional day of training, mutants can distinguish between target and nontarget quadrants when tested 14 days after last hidden platform training day, mutants exhibit loss of spatial memory compared with wild-type and heterozygous mice; memory formation occurs, but is less stable |