That creates this rightward shift in the oxygen binding curve. This molecule is precisely why this curve shifts to this blue curve as shown in the following diagram. So this molecule is an allosteric effector of hemoglobin. What that means is it binds onto a location that is different than where oxygen binds to, and it creates some type of change in the function in the affinity of that hemoglobin molecule for oxygen. Now, before we discuss where that molecule actually binds to, let's recall one important fact about deoxyhemoglobin. So, deoxy hemoglobin exists in the T state, in the ten state.