JUAN GAERTNER / SCIENCE PHOTO LIBRARY JUAN GAERTNER / SCIENCE PHOTO LIBRARY
Met-enkephalin molecule. Computer illustration of the neurotransmitter met-enkephalin (methionine-enkephalin). Met-enkephalin is one of two forms of enkephalin. Enkephalins are endorphins and are found in the central nervous system where they bind to the body's opioid receptors. Endorphins are produced in the brain by the pituitary gland and hypothalamus and act as natural pain relievers.
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