Which of the following is not a branched-chain amino acid?

leucine
valine
cystine
isoleucine
A branched-chain amino acid (BCAA) is an amino acid having aliphatic side-chains with a branch. Among the proteinogenic amino acids, there are three BCAAs: leucine, isoleucine and valine. They 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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Answers by country

leucine
valine
cystine
isoleucine
answers
flagthe United States
0%
20%
60%
20%
10
flagAustralia
0%
36%
36%
27%
11
flagPoland
16%
28%
32%
22%
2143
flagGermany
15%
46%
23%
15%
13