Now, cysteine proteases such as cat space and cathepsen are involved in programmed cell death, also known as epitosis. And this is basically an immune response that our body has. And this process is also involved in a normal embryological development of that human embryo. Now, other evidence also suggests that we have 16 proteases that are involved in bone remodeling as well as MHC class two processing. And remember, MHC class two is a protein complex found on certain cells, immune cells of our body where MHC stands for the major historic compatibility class two complex. Now, these cysteine proteases are also found in many other organisms and they are found predominantly in fruits.