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Ultrastructural analysis of spines. (a–d) Samples of dendritic profiles. Proximal dendrites: vehicle (a), TTX (b); spiny branchlets: vehicle (c), TTX (d). (e) Mean density values per 100 μm and standard deviations under the four conditions. (f–h) Spine interval histograms; ordinates: number of intervals; bin width: 0.2 μm. (Scale bar = 1 μm.)
