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Orientation index. (a) Mean orientation index 
(solid) ± standard deviation (dashed) as a function of age. (b) Mean orientation index as a function of age for the caudal site (solid), distal site (dashed) and rostral site (dotted). The model predicts significant differences for: 'x' - rostral site > caudal site and '+' - distal site > caudal site.
