Proteases are a type of enzyme that catalyze the hydrolysis of peptide bonds in proteins, resulting in the breakdown of proteins. Common examples of proteases include: 

Trypsin– Present in pancreatic juice, trypsin is involved in breaking down proteins and peptones to dipeptides. 

Carboxypeptidase– Similar to trypsin, carboxypeptidase is also found in pancreatic juice and involved in breaking down proteins and peptones to dipeptides. 

Dipeptidase– Dipeptidase is responsible for breaking down dipeptides to amino acids and is found in intestinal secretion. 

Rennin– Rennin is a type of protease that is secreted by chief cells that are found in the stomach. They assist in curdling milk protein. 

Elastase– Found in pancreatic juice, elastase helps in the digestion of elastin. 

Insulinase– Insulin plays a key role in degrading insulin and is found in the liver and kidney. 

Renin– Renin is responsible for producing angiotensin from angiotensinogen. It is secreted by specialized kidney cells known as juxtaglomerular cells.  

Hyaluronidase– Found in the acrosome of sperms, hyaluronidase plays a key role in fertilization where it helps the sperm to penetrate the ovum.