from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A white crystalline amino acid, C6H12N2O4S2, formed from the disulfide linkage of two cysteines during folding of many proteins, especially keratin, and stabilizing the tertiary structure of the protein.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Physiol. Chem.) A white crystalline substance, C3H7NSO2, containing sulphur, occuring as a constituent of certain rare urinary calculi, and occasionally found as a sediment in urine.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry a nonessential amino acid formed by the oxidation of cysteine; it contains two cycteine residues linked by a disulfide bond

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a crystalline amino acid found in proteins (especially keratin); discovered in bladder stones


from The American Heritage® Dictionary of the English Language, 4th Edition

[From its discovery in bladder stones.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek κύστις ("bladder"), where it was found.


  • This occurs in cystine, which is known from the work of Count K.A.H. Mörner as a component of the protein molecule.

    Albrecht Kossel - Nobel Lecture

  • However, when it is present as a cysteine-cysteine dipeptide, called cystine, it is more stable than cysteine.

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  • The four most common types of stones are comprised of calcium, uric acid, struvite, and cystine.

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  • Undenatured whey protein is a non-heated product that preserves bioactive amino acids like cystine.

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  • J'suis un peu balonné, j'ai recommencé la cystine et ca a un effet devastateur au niveau d'mes intestinc ...

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  • Ce qui s'est passé j'en sais rien je prend ma demie Ritaline, ma cystine B6 et me reecroule.

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  • Further, acid hydrolysis would convert cysteine to cystine, and hydrolysis would destroy serine, threonine, cystine, cysteine, and arginine in the alkaline solution generally regarded to have characterized the early ocean.

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  • The exceptional content of sulfur amino acids (methionine plus cystine) should make fonio an excellent complement to legumes.

    3. Fonio (Acha)

  • In his Edible Leaves of the Tropics he adds that the leaves are incomparable as a source of the sulfur-containing amino acids methionine and cystine, which are often in short supply.

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  • In particular, protein fractionation is likely to turn up fractions with methionine and cystine levels even greater than fonio's already amazingly high average.

    3. Fonio (Acha)


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