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Fig. 3.

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Patchy lateral (or horizontal) connections in layers 2/3 of macaque area V1. A surface view 2D composite reconstruction of CTB-labeled connections is shown. The labeled field axes measured 9 × 6 mm. Black oval, CTB uptake zone; blank annulus, region of heavy label. Note anisotropic distribution of overall label. The foveal representation is toward the bottom (lateral V1); the V1–V2 border is to the right (anterior V1). Small square, Labeled patch shown at higher power in the inset. Scale bar, 500 μm (corrected for 30% shrinkage). Inset,High-power drawing of patch in the small square, showing labeled fibers and somata (dots), indicating reciprocity of connections. Scale bar, 100 μm.

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