Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. organic material
7. protein

Narrower term/s

• gelatin [NP][+]
  • photographic gelatin
• animal glue [NP][+]
  • bone glue
  • fish glue [+]
    • isinglass (fish glue)
  • hide glue [+]
    • rabbitskin glue
• ossein [NP]

Anotations

Scope note:

The fibrous, extracellular matrix protein in skin, muscles, tendons, ligaments, and bone. Collagen is composed of repeating units of glycine-proline-hydroxyproline that form linear polypeptide chains; three chains are then twisted and interlocked with hydrogen bonding to form a rigid helix structure. Collagen-containing materials, such as hides, bones and fish, have been used to make animal glues since ancient times. Collagen will irreversibly hydrolyze, or denature, in hot water, forming a water-soluble gelatin.