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Nissl staining of neurons and glia from different species in layer II/III of area 9L. Arrows indicate examples of neurons, and arrowheads indicate examples of glia. Aotus trivirgatus (A), Saguinus oedipus (B), Alouatta caraya (C), Pithecia pithecia (D), Trachypithecus francoisi (E), Colobus angolensis (F), Cercopithecus kandti (G), Hylobates muelleri (H), and Pongo pygmaeus (I). (Scale bar, 50 μm.)
