Extended Data Figure 1. Cytoarchitecture and neuronal subtype lamination in the mature Aspm KO ferret cortex.

a, Nissl stains of P41 littermate coronal sections, as shown in Fig. 1l, with additional Aspm+/− and Aspm−/− littermates shown. b, c, P41 littermates immunostained for cortical layer-specific projection neurons including Satb2 (layer II–IV), Ctip2 (layer V), and FoxP2 (layer VI). The experiments were repeated 3 times independently with similar results. Scale bars: 2 mm (a, top), 200 μm (a, bottom), 100 μm (b–c).