And notice there is a great deal of similarity between this molecule and this transition state. Now, the final question that I want to discuss is what exactly is the usefulness of this transition state analog? So one usefulness is the ability to build a molecule that is a very good inhibitor to some particular type of enzyme. So for instance, if a bacterial cell, if a bacteria infects our body, then one way to inhibit the activity of that bacterial cell is to inhibit in some way some type of enzyme by using transition state analogues. Now, another important application of transition state analogs is the following. We can actually create antibodies that have specific catalytic capabilities by using these transition state analogues.