
1) An essential amino acid 2) Essential amino acid 3) Essential amino acid 4) Ketogenic amino acid
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((CH
3)
2CHCH
2CH(NH
2)COOH) A naturally occuring aliphatic amino acid with a nonpolar side chain.
Found on
http://antoine.frostburg.edu/chem/senese/101/glossary/l.shtml

Leucine (abbreviated as Leu or L) is a branched-chain α-amino acid with the chemical formula HO2CCH(NH2)CH2CH(CH3)2. Leucine is classified as a hydrophobic amino acid due to its aliphatic isobutyl side chain. It is encoded by six codons (UUA, UUG, CUU, CUC, CUA, and CUG) and is a major component of the subunits in ferritin, astacin, and other `b....
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http://en.wikipedia.org/wiki/Leucine

an amino acid obtainable by the hydrolysis of most common proteins. Among the first of the amino acids to be discovered (1819), in muscle fibre and ... [7 related articles]
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http://www.britannica.com/eb/a-z/l/39

<amino acid> The most abundant amino acid found in proteins. Confers hydrophobicity and has a structural rather than a chemical role. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(loo´sēn) a naturally occurring essential amino acid that is necessary for growth in infants and for nitrogen equilibrium in adults.
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http://www.encyclo.co.uk/local/21001

(= leu; L; 2-amino-4-methylpentanoic acid; 131 D) The most abundant amino acid found in proteins. Confers hydrophobicity and has a structural rather than a chemical role. See Table A2.
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(Leu, L) Type: Term Pronunciation: lū′sēn Definitions: 1. the l-isomer is one of the amino acids found in proteins; a nutritionally essential amino acid.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=48966

Leucine: An amino acid, one of the 20 building blocks of protein. A dietary essential amino acid, leucine is needed for optimal growth in childhood. It is one of the three branched-chain amino acids. Symbol: Leu.
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http://www.medterms.com/script/main/art.asp?articlekey=22829

[
n] - a white crystalline amino acid occurring in proteins that is essential for nutrition
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http://www.webdictionary.co.uk/definition.php?query=leucine
noun a white crystalline amino acid occurring in proteins that is essential for nutrition; obtained by the hydrolysis of most dietary proteins
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https://www.encyclo.co.uk/local/20974
No exact match found.