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Postnatal changes in the percentage of contacted PC spines. The total numbers of PC spines analyzed from mutant and wild-type mice are n = 60 or 60 at P7,n = 122 or 116 at P14, n = 60 or 90 at P21, and n = 271 or 253 at P35, respectively. p = 0.32 at P7, 0.02 at P14 and P21, and 0.009 at P35. Statistics, Student’s t test.
