Credit: KARL GAFF/SCIENCE PHOTO LIBRARY

Caption: Dopamine crystallisation. Time-lapse polarised light microscopy footage of the formation of crystals of dopamine. Dopamine is a neurotransmitter and a peripheral hormone. It plays a key role in the control of locomotion, reward-motivated behaviour, 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 marketed under various trade names, including Intropin and Revivan.

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