And these other sites are known as allosteric sites. And we'll see many examples in the next several lectures or in future lectures. Now, on top of that, these other portions of the enzyme can also interact with different types of components found in the cell. For example, we have a variety of different types of proteins and enzymes found in a cell membrane that actually bind onto that cell membrane. And so these other sections of the enzyme can be responsible for actually adhering and binding onto the cell machinery. For example, the membrane of the cell.