| The proteins of soyabean yields all essential amino acids in adequate amounts, except methionine and cystine. |
| Decomposition of urine containing cystine or pus will have the odor of rotten eggs. |
| However, cystine crystals in the cornea are not usually detectable in the first year. |
| In 1812, William Hyde Wollaston found a substance in urine that he identified as a cystic oxide, and was later named cystine. |
| Once inside a cell, cystine is rapidly reduced to cysteine that, as a precursor of GSH, undergoes GSH synthesis. |
| Cysteamine enters the lysosomes by a specific transporter and converts cystine to cysteine and cysteine-cysteamine mixed disulfide. |
