Share this entry
cystine Line breaks: cyst|ine
Pronunciation: /ˈsɪstiːn/

Definition of cystine in English:


[mass noun] Biochemistry
A compound which is an oxidized dimer of cysteine and is the form in which cysteine often occurs in organic tissue.
  • Chemical formula: C6H12N2O4S2
Example sentences
  • The sulfur-containing amino acids are methionine, cysteine, cystine, homocysteine, homocystine, and taurine.
  • Cysteine in the extracellular space is mostly oxidized to cystine.
  • Glutathione conjugation uses Nacetylcysteine, cysteine, and methionine; cystine is used for sulfation; and glucuronidation requires pantothenic acid.


Mid 19th century: from Greek kustis 'bladder' (because it was first isolated from urinary calculi) + -ine4.

Definition of cystine in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove ads and access premium resources