Bidirectional regulation of α-chimaerin protein expression by age and dark rearing in mouse visual cortex. A. Western blots showing levels of α1- and α2-chimaerin and actin protein expression in mouse visual cortex. B and C. Mean levels of α-chimaerin isoform expression as determined by densitometry from three independent groups of mice. Means +/- S.E. are plotted. Data from each group were normalized against N9.5 animals. Statistical significance of relevant normal/dark reared post hoc comparisons is indicated.