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Photo of a section from a human brain.

photo of a section from a human brain

Photomicrograph of a section from the human brain, stained for acetylcholinesterase, an enzyme that degrades neurotransmitter acetylcholine. This staining procedure revealed pockets of low enzyme activity, which appear dark in this light-dark reversed image. These are the histochemically identified striosomes.

Credit: Ann Graybiel

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