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39p x 55p R. Scott Horner color illustration of human nuerons. (Sun... News Photo1997,Acetylcholine,Anatomy,Brain,Cerebellum,Cerebrum,Cholinesterase,Color Image,Dendrite,Engine,Florida - US State,Gulf Coast States,Human Interest,Human Nervous System,Illustration,Illustration Technique,Medulla,Midbrain,Neural Axon,Neurotransmitter,People,Physiology,Pons,Science,Sensory Perception,Synapse,Thalamus,USA,Vertical,VesiclePhotographer Collection: Tribune News Service 1997 MCTUSA - 1997: 39p x 55p R. Scott Horner color illustration of human nuerons. (Sun Sentinel (Fort Lauderdale, Fla.)/MCT via Getty Images)