
1) Essential amino acid 2) Essential amino acid 3) Isomeric with leucine 4) Ketogenic amino acid
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https://www.crosswordclues.com/clue/isoleucine

((CH
3)
2CHCH(NH
2)COOH) A naturally occuring amino acid with a nonpolar side chain.
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http://antoine.frostburg.edu/chem/senese/101/glossary/i.shtml

Isoleucine (abbreviated as Ile or I) is an α-amino acid with the chemical formula HO2CCH(NH2)CH(CH3)CH2CH3. It is an essential amino acid, which means that humans cannot synthesize it, so it must be ingested. Its codons are AUU, AUC and AUA. With a hydrocarbon side chain, isoleucine is classified as a hydrophobic amino acid. Together with threoni...
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http://en.wikipedia.org/wiki/Isoleucine

an amino acid present in most common proteins, sometimes comprising 2 to 10 percent by weight. First isolated in 1904 from fibrin, a protein ... [5 related articles]
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http://www.britannica.com/eb/a-z/i/44

<amino acid> Hydrophobic amino acid. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(i″so-loo´sēn) a naturally occurring essential amino acid produced by hydrolysis of fibrin and other proteins; it is necessary for optimal infant growth and for nitrogen equilibrium in adults.
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http://www.encyclo.co.uk/local/21001

(= Ileu; I; 131 D) Hydrophobic amino acid. See Table A2.
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http://www.encyclo.co.uk/visitor-contributions.php
(I) Type: Term Pronunciation: ī′sō-lū′sēn Definitions: 1. the l-stereoisomer is found in almost all proteins; an isomer of leucine and, like it, a dietary essential amino acid.
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http://www.medilexicon.com/medicaldictionary.php?t=45903

Isoleucine: An amino acid, one of the 20 building blocks of protein. A dietary essential amino acid, isoleucine is needed for optimal growth in childhood. It is one of the three branched-chain amino acids. Symbol: Ile.
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http://www.medterms.com/script/main/art.asp?articlekey=22828

[
n] - an essential amino acid found in proteins
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http://www.webdictionary.co.uk/definition.php?query=isoleucine

a crystalline amino acid, CHO, occurring in proteins, that is essential to the nutrition of humans and animals. Abbr.: Ile; Symbol: I
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https://www.infoplease.com/dictionary/isoleucine
No exact match found.