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Cytochrome oxidase staining of area V1 in the New World monkeys Saimiri (A) and Ateles (B), the Old World monkey Macaca (C), and the hominoids Pongo (D), Pan (E), and Homo (F). A CO-dense band is present in layer 4A in all of the monkeys, even those that were immersion fixed (as in C), but is absent in all of the hominoids, including perfusion-fixed chimpanzees (as in E). (Bar = 500 μm.)
