Medical Definition of Valine
Valine: An amino acid, one of the 20 building blocks of protein. A dietary essential amino acid, valine is required for optimal growth of children. It is one of the three branched-chain amino acids. Deficiency of the dehydrogenase enzyme for these branched-chain amino acids causes maple syrup urine disease. Symbol: Val.
Last Editorial Review: 6/9/2016
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