KARL GAFF / SCIENCE PHOTO LIBRARY KARL GAFF / SCIENCE PHOTO LIBRARY
Polarised light micrograph of dopamine (3,4-dihydroxyphenethylamine) crystals. Dopamine is a neurotransmitter. There are several dopamine pathways in the brain, one of which is associated with reward-motivated behaviour. Rewards increase the production of dopamine in the brain, giving a sense of happiness.
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