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Fig. 7. Measures of spatial memory performance of frizzled 9 mutant mice [+/+
(n=8), +/ (n=12), / (n=9)]
tested in the Morris water maze (Morris,
1984) under the place/spatial testing condition. Presented are
Probe Times in seconds (A) and Number of Annulus Crossings (B) measured during
probe trials (i.e. memory trials). The frizzled 9 mutant (/)
mice displayed significantly (*P<0.04) poorer spatial
memory performance on both measures than the +/+ mice, and the +/ mice
tended to be intermediate.