As we'll see in the next several electros actually make water a much better nucleophile and they make the carbon a much better electrophile. They make these reactants much more reactive and that facilitates this hydrolysis reaction. Now we can actually categorize proteases into different categories. And these are five categories of proteases. We have seren proteases, we have cystine proteases, we have metalloprotiases and we have aspartape proteases. And we'll discuss these in much more detail in the next several lectures.