Figure 3.
Immunostaining for NPNF in Saimiri (A), Ateles (B), Macaca (C), Pongo (D), Pan (E), and four human individuals (F–I). Humans are distinguished from other primates by bands of dark-staining tissue that extend into layer 4A from layer 4B. These bands surround and cap small territories of lightly stained tissue in layer 4A, giving this layer a distinctive, mesh-like appearance. The dense and extensive NPNF immunoreactivity evident in layer 3 of apes (D, E) and humans (F–I) is a general characteristic of neocortex in these taxa, not a specific characteristic of area V1. (Bar = 500 μm.)