So we discussed allosteric regulation, we discussed covalent modification and proteolytic activation. Now, we're going to discuss yet another mechanism that our body uses. And this mechanism involves using different forms of the same type of enzyme to carry out a single specific type of reaction that basically takes place at different locations and different times in our body. And these different forms of the same type of enzyme are known as isozymes or ISO enzymes. So isozymes generally allow our body to regulate the same type of biochemical reaction that takes place at different locations and sometimes at different times. Now, before we actually look at a specific example of ISO enzymes, let's generalize what we know about isozymes or ISO enzymes.