This occurs in cystine, which is known from the work of Count K.A.H. Mörner as a component of the protein molecule.    From Wordnik.com.  [Albrecht Kossel - Nobel Lecture] Reference

However, when it is present as a cysteine-cysteine dipeptide, called cystine, it is more stable than cysteine.    From Wordnik.com.  [Food Sources That Boost Glutathione Naturally] Reference

The sulphur is present in cystine.    From Wordnik.com.  [Nobel Prize in Chemistry 1955 - Presentation Speech] Reference

Cysteine (sis'tih-een; because it is chemically related to cystine).    From Wordnik.com.  [The Human Brain]

Vigneaud's numerous works on cystine, methionine, and related compounds.    From Wordnik.com.  [Nobel Prize in Chemistry 1955 - Presentation Speech] Reference

It also has a high level of cystine, a feature that is an even rarer find in a cereal.    From Wordnik.com.  [Chapter 8] Reference

Undenatured whey protein is a non-heated product that preserves bioactive amino acids like cystine.    From Wordnik.com.  [Food Sources That Boost Glutathione Naturally] Reference

In the white fonio analysis, for example, the protein contained 7.3 percent methionine plus cystine.    From Wordnik.com.  [3. Fonio (Acha)] Reference

Overall availability was 84%, but CLM was low in the sulfur-bearing amino acids cystine (66.7%) and methionine (69.9%).    From Wordnik.com.  [Chapter 25] Reference

The exceptional content of sulfur amino acids (methionine plus cystine) should make fonio an excellent complement to legumes.    From Wordnik.com.  [3. Fonio (Acha)] Reference

It is the "half-cystine" they usually deal with in considering protein structure and it is this that is symbolized by cy-S.    From Wordnik.com.  [The Human Brain]

The abbreviations for cystine and cysteine are more cryptic and deserve some explanation, for they will be important later on.    From Wordnik.com.  [The Human Brain]

Since sulphur-containing amino acids, methionine and cystine, can be involved in detoxification there may be an enhanced need for these.    From Wordnik.com.  [Chapter 6] Reference

The main protein fraction (eleusinin) has high biological value, with good amounts of tryptophan, cystine, methionine, and total aromatic amino acids.    From Wordnik.com.  [2. Finger Millet] Reference

In particular, protein fractionation is likely to turn up fractions with methionine and cystine levels even greater than fonio's already amazingly high average.    From Wordnik.com.  [3. Fonio (Acha)] Reference

Its seed is rich in methionine and cystine, amino acids vital to human health and deficient in today's major cereals: wheat, rice, maize, sorghum, barley, and rye.    From Wordnik.com.  [3. Fonio (Acha)] Reference

Considering the special properties of insulin, one could perhaps expect to find its sulphur in quite a new combination, but it turned out that it was present in cystine.    From Wordnik.com.  [Nobel Prize in Chemistry 1955 - Presentation Speech] Reference

Fig. 7, divisions A and B, represent different forms of cystine.    From Wordnik.com.  [The People's Common Sense Medical Adviser in Plain English or, Medicine Simplified, 54th ed., One Million, Six Hundred and Fifty Thousand] Reference

Like many of the other stones, cystine is more soluble is a basic solution.    From Wordnik.com.  [Press Release] Reference

This led to an average drop in cystine levels of about 80 percent in every organ.    From Wordnik.com.  [Health News from Medical News Today] Reference

Repairing of low-temperature injury in rice seedlings by thiourea, cystine and potassium thiocyanate.    From Wordnik.com.  [xml's Blinklist.com] Reference

Cells are able to take cysteine from the culture media both in its oxidized, cystine, and reduced forms.    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference

"What's exciting is there are already known ways to intervene and drive down cystine levels in patients.".    From Wordnik.com.  [Health News from Medical News Today] Reference

For example, a previous study has shown that supplementing the diet with zinc can lower cystine levels, he says.    From Wordnik.com.  [Health News from Medical News Today] Reference

The team's future plans include comparing cystine to other markers of inflammation and understanding the relationships between them.    From Wordnik.com.  [Health News from Medical News Today] Reference

(e.g. lysine and the sulphur-containing cystine and methionine).    From Wordnik.com.  [Chapter 5] Reference

(1) This is because glutathione is manufactured inside the cell, from its precursor amino acids, glycine, glutamate and cystine.    From Wordnik.com.  [Food Sources That Boost Glutathione Naturally] Reference