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Photomicrographs of AChE-stained brain sections indicating regions measured in this study: lateral geniculate nucleus (LGN), superior colliculus (SC), medial geniculate nucleus (MGN), and inferior colliculus (IC). Labels are restricted to African grass rat (diurnal). Other species shown are Australian bush rat (nocturnal), North American red squirrel (diurnal), and southern flying squirrel (nocturnal). Scale bar in upper right.
