Branched-chain amino acid

[ Branched-chain amino acid, BCAA ]

An amino acid having aliphatic side-chains with a branch. The three proteinogenic branched-chained amino acids are leucine, isoleucine and valine. Non-proteinogenic BCAAs include 2-aminoisobutyric acid.

The three proteinogenic BCAAs are among the nine essential amino acids for humans, accounting for 35% of the essential amino acids in muscle proteins and 40% of the preformed amino acids required by mammals.

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