So we have three important types of peptidases that we should be familiar with. We have tryptogen, we have china trypsinogen, and we have our carboxy peptidase. So trypsinogen is this xiaomogen that we spoke of earlier. So our pancreas produces our trypsinogen. And when our interkinase mixes with trypsinogen, it cleaves it and it forms the active form known as trypsin. And trypsin doesn't only cleave peptides at specific peptide buns, but it also activates other enzymes, as we'll see in just a moment.