Cathepsin refers to a group of enzymes that play a crucial role in breaking down proteins within cells. These enzymes are primarily found in lysosomes, which are cellular structures responsible for digestion and waste removal. Cathepsins help in various biological processes, including tissue remodeling, immune response, and the recycling of cellular components. There are several types of cathepsins, each with specific functions. For example, cathepsin B is involved in protein degradation and has been studied for its role in diseases like cancer and neurodegenerative disorders. Understanding cathepsins is important for developing potential therapies targeting these enzymes in various health conditions.