Assertion: collagen's acid | /r/HasProperty | proline
Facets:
Source sentences:
text: Collagen is a protein consisting of four amino acids: Proline, Glycine, Arginine, and Hydroxyproline.
text: Collagen is made primarily of three amino acids—proline, hydroxyproline and glycine-which help our bodies carry out important functions, such as building and repairing muscles and tissues.
text: It is made primarily of three amino acids — proline, hydroxyproline and glycine
text: Many of the remaining positions in the chain are filled by two amino acids: proline and a modified version of proline, hydroxyproline.