- a crystalline amino acid, C6H12O4N2S2, occurring in most proteins, especially the keratins in hair, wool, and horn, and yielding cysteine on reduction.
Origin of cystine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for cystine
- a sulphur-containing amino acid present in proteins: yields two molecules of cysteine on reduction. Formula: HOOCCH(NH 2)CH 2 SSCH 2 CH(NH 2)COOH
C19: see cysto- (bladder), -ine ²; named from its being discovered in a type of urinary calculus
- A white crystalline amino acid that is found in many proteins, especially keratin, and is the major source of metabolic sulfur.