Fig. 3. Camera lucida drawings of representative axons crossing stripes with membranes from cortical layer 4 (dark gray) and membranes from cortical layer 5 (light gray). In A, thalamic axons extend first on a membrane stripe from their target layer, whereas in B the axons encounter first a membrane stripe from a non-target layer. In each case, thalamic axons branch preferentially on their appropriate target membranes. Scale bar: 50 µm.

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