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Human brain. Computer illustration of a section through a normal human brain, showing the different structures. The front of the brain is at right. Structures seen here include the: cortex (wrinkled), cerebellum (lower right), brainstem (lower centre-left) and corpus callosum (light, horizontal, upper centre). (KEYSTONE/SCIENCE PHOTO LIBRARY/MAURIZIO DE ANGELIS/SCIENCE PHOTO LIBRARY)