And so other molecules, for example, water molecules, will not be able to enter the active side and that means the water molecules will not be able to hydrolyze this section. And so that will decrease the likelihood that any competing reaction will take place. Because remember, the problem is if we don't have the NMP kinase and these two molecules are in the presence of water, water will be very likely to actually hydrolyze and break this bond here. And what that means is instead of transferring the phosphoryl group onto the NMP, that phosphoryl group will be transferred onto the water molecule. And so what the enzyme does is it utilizes catalysis by proximity. It closes off the active side and keeps away the water molecules and so no competing reactions can actually take place.