Uses for biomolecules outside the body

[Reckoner]

For our chem SAC, we have to do an in-class poster on biomolecules. One of the criteria is "uses in and out of the body". I'm having some trouble coming up with some uses for biomolecules (particularly proteins) outside the body. Any ideas?

[pi]

First example that came into my head (not sure if valid) is to make Protein Supps (that powder stuff that some weightlifters take).