And one common example is insulin. And this is the hormone that is basically used to regulate the glucose level, the sugar level in our blood. So our cells first synthesize insulin in the prepro insulin form. And prepro insulin must undergo a single proteolytic cleavage at a single site to basically produce proinsulin. But proinsulin is not yet a fully functional enzyme. Proinsulin then undergoes two proteolytic cleavages to essentially form the active form known as insulin.