![](http://www.alamy.com/thumbs/6/0B8B239E-9ADE-4EDF-9EF5-266797CCD2AE/2HFKDAE.jpg)
Met-enkephalin molecule. It is endogenous opioid peptide. Structural chemical formula on the dark blue background. Vector illustration
Size: 5000px × 2333px
Photo credit: © Liliya / Alamy / Afripics
License: Royalty Free
Model Released: No
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