But collagen must be activated from its pro enzyme form from its zymogen form and the Xymogen form is known as pro collagen. In fact this leads us directly into six. We have another enzyme known as collagenase which is actually responsible for activating the pro collagen into collagen. And so collagenase is the enzyme that catalyzes the cleavage of peptide bonds in collagen. And this can either actually activate that collagen molecule or it can break down that collagen molecule and destroy that collagen structure. And this process is important in remodeling of the extracellular environment as well as the development of the embryo.