Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by property]
6. acid
7. amino acid

Anotations

Scope note:

A crystalline, sulfur-containing amino acid that is formed from two molecules of the amino acid cysteine. Cystine can be converted to cysteine by reduction. Cystine is particularly abundant in skeletal and connective tissues and in hair, horn, and wool.