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Amino Acids - Valine |
 | | Valine, an essential amino acid, is hydrophobic, and as expected, is usually found in the interior of proteins. |
| | Valine differs from threonine by replacement of the hydroxyl group with a methyl substituent. |
| | Valine is often referred to as one of the amino acids with hydrocarbon side chains, or as a branched chain amino acid. |
| www.biology.arizona.edu /biochemistry/problem_sets/aa/Valine.html (100 words) |
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