Pepsin
Pepsin is a proteolytic enzyme produced by cells of the gastric mucosa, which breaks down proteins inside the peptide chain for easier water-soluble peptides. It catalyzes the hydrolysis of bonds between the amino group of tyrosine and phenylalanine and aspartic acid or glutamic.
Fig.1: crystal structure of pepsin (source: http://en.wikipedia.org/wiki/Pepsin)
Other substances
Amygdalin
Adenine
Betacarotene
Biotin
Choline
Ginkgo biloba
Guarana
Inositol
Carnitine
Coenzyme q10
Laetrile
Lecithin
Lutein
Pyridoxine
Ubiquinone
Acids
Enzymes
Partner sites