And finally, the final important point to remember about enzymes is that enzymes are not actually used up. They are not actually consumed in any reaction. And if the enzyme is altered in some way, and usually they are, they are regenerated, the final enzyme is exactly the same as the initial enzyme that basically went into that reaction. So enzymes themselves are not actually consumed during reactions, although they might alter in some way. For example, when the reaction binds to the active side of our enzyme, it might change its shape ever so slightly. But at the end of the reaction, our enzyme is always regenerated in the same form as it basically went in to our reaction.