cysteine
[sis-tee-een, -in]
- a crystalline amino acid, C3H7O2NS, a component of nearly all proteins, obtained by the reduction of cystine. Abbreviation: Cys; Symbol: C
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Origin of cysteine
First recorded in 1880–85; alteration of cystine
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for cysteine
Contemporary Examples
Eggs, he says, are a good source of cysteine, an amino acid that helps the liver break down alcohol faster.
cysteine
- a sulphur-containing amino acid, present in proteins, that oxidizes on exposure to air to form cystine. Formula: HSCH 2 CH(NH 2)COOH
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Word Origin
C19: variant of cystine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
cysteine
(sĭs′tē-ēn′, -ĭn, sĭ-stē′ĭn)- An alpha-amino acid found in most proteins and especially abundant in keratin.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
cysteine
[sĭs′tə-ēn′]
- A nonessential amino acid. Chemical formula: C3H7NO2S. See more at amino acid.
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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.