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Polarized light micrograph of dopamine hydrochloride (trade names: Intropin, Revivan, etc.) crystals. It acts as a neurotransmitter and as a peripheral hormone, and plays a key role in the control of locomotion, reward-motivated behavior, learning, working memory, cognition, and emotion. In the brain, altered levels of dopamine activity are linked to Parkinson's disease, schizophrenia, fibromyalgia, and amphetamine and cocaine addiction. It is a vasodilator agent: in the kidneys it increases sodium excretion and urine output (renal dopamine may contribute to hypertension); it reduces insulin production and the activity of lymphocytes; it reduces gastrointestinal motility; and it increases heart rate and cardiac contractility. Field of view size: 0.740 x 1.110 mm (0.0291 x 0.0437 in)

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