We have the T state, known as the ten state and we have the r state, also known as the relaxed state. Now, what's the difference between the T state and the r state? Well, in the T state, as a result of the confirmation of the dimer structure, these active sites of the enzyme are partially blocked. And what that means is the activity of the enzyme when it's in the T state will be low. In contrast, in the r state, as a result of the loose confirmation of the dimer structure, the active sites are actually open. And what that means is the r state is the fully active form of this enzyme.