The Hunger Games is unwritten.
Pepsin is an enzyme that breaks down proteins into smaller peptides -LRB- that is , a protease -RRB- .. protease. protease. It is produced in the stomach and is one of the main digestive enzymes in the digestive systems of humans and many other animals , where it helps digest the proteins in food .. stomach. stomach. digest. digestion. food. food. Pepsin has three dimensional structure , of which one or more polypeptide chains twist and fold , bringing together a small number of amino acids to form the active site , or the location on the enzyme where the substrate binds and the reaction takes place. active site. active site. It is one of three principal proteases in the human digestive system , the other two being chymotrypsin and trypsin .. digestive system. digestive system. chymotrypsin. chymotrypsin. trypsin. trypsin. During the process of digestion , these enzymes , each of which is specialized in severing links between particular types of amino acids , collaborate to break down dietary proteins into their components , i.e. , peptides and amino acids , which can be readily absorbed by the small intestine .. absorbed by the small intestine. small intestine#Absorption. Pepsin is most efficient in cleaving peptide bonds between hydrophobic and preferably aromatic amino acids such as phenylalanine , tryptophan , and tyrosine .. peptide. peptide. hydrophobic. hydrophobe. aromatic. aromaticity. phenylalanine. phenylalanine. tryptophan. tryptophan. tyrosine. tyrosine. Pepsin 's proenzyme , pepsinogen , is released by the chief cells in the stomach wall , and upon mixing with the hydrochloric acid of the gastric juice , pepsinogen activates to become pepsin .. stomach. stomach. proenzyme. zymogen. hydrochloric acid. hydrochloric acid. gastric juice. gastric acid. Pepsin is an aspartic protease , using a catalytic aspartate in its active site .. protease. protease. aspartic protease. aspartic protease. active site. active site