Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An amino acid, C3H7O2NS, derived from cystine and found in most proteins.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biochemistry  A sulphur -containing nonessential amino acid C3H7NO2S found in mostanimal proteins ; it readilyoxidizes tocystine .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an amino acid containing sulfur that is found in most proteins; oxidizes on exposure to air to form cystine
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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								Bacteria start self-cleaving in response to a molecule inside cells called InsP6, which in turn activates a process called cysteine protease. For a Mother's Touch, Skip the Text Messages Ann Lukits 2011 
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								All these contain an amino acid called cysteine, the basic building block of glutathione. The UltraMind Solution M.D. Mark Hyman 2009 
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								Nevertheless, whey is rich in glutamylcystine, a very stable and an easy to get inside the cell form of cysteine, which is a precursor of glutathione, and low glutathiione levels have been implicated in overtraining, cancer, Hepatitis, AIDS, Parkinson, Cystic Fibrosis and Sarcopenia lost of muscle mass. Milk. It does a body good. Or Not. | The Blog of Michael R. Eades, M.D. 2006 
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								Among dozens of components known to exist in this crude extract, the best studied components are a group of protein-digesting enzymes (called cysteine proteinases). 
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								Among dozens of components known to exist in this crude extract, the best studied components are a group of protein-digesting enzymes (called cysteine proteinases). 
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								Researchers believe it has to do with the amino acid cysteine, which is released from the chicken as it cooks. 
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								Eggs and meat are rich in amino acid cysteine, which is thought to be good at clearing out toxins. Mirror.co.uk - News 2009 
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								Some manufacturers use an ingredient called L-cysteine, which is a protein made from pig or other animal hair and which is used to soften the dough. Home | Mail Online 2009 
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								This is also supported by an enrichment of protein functions such as cysteine-type endopeptidase activity, lysozyme activity, or lipase activity. 
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								The thyroid uses glutathione, a combination of three amino acids (glycine, glutamine, and cysteine), protectively as an antioxidant or free radical quencher and as a cofactor that makes it possible for one of its most important enzymes (5'-deiodinase) to work (6). Dr. James P. Blumenthal: Healthy Tips For Protecting Your Body From Radiation And Nuclear Fallout Dr. James P. Blumenthal 2011 
lbury commented on the word cysteine
part of homocysteine; a still arguable indicator of cardiovascular disease.
September 21, 2008