And we need all these different enzymes to be able to cleave all the different peptide bonds that are found within the proteins that we actually ingest. And the interesting thing about the trypsin molecule that we discussed earlier, trypsin doesn't only activate the chinatriptcinogen, it also activates many other zymogens. And so in a way, we can imagine that trypsin is actually the master activator which is responsible for actually activating the majority of the xiaogens found inside our body. Now, the question is what activates the trypsin itself? Well, the cells of our body basically produce a special type of enzyme known as anterappeptidase. So it's the anteripeptidase that is produced by our body that actually activates trypsin from tryptinogen.