Gelatin contains specific amounts of 18 different amino acids (AA) which are joined together in sequences to form polypeptide chains of ca. 1000 AA per chain, scientifically known as the primary structure. Three of the polypeptide chains formed this way join together as a left-hand spiral to give the secondary structure. In the tertiary structure, the spiral winds and folds itself to a right-hand spiral (triple helix). This results in a rod-shaped molecule, the so-called proto fibril.