Well, about ten to somewhere around 14% of the CO2 molecules will actually bind to hemoglobin. So for our discussion, let's assume that it's 10%. So that we're dealing with a single value. So about 10% of the CO2 molecules, once they're inside the red blood cell, will bind direct to the hemoglobin and will travel to the lungs by being bound to that hemoglobin. Now, the remaining percentage, so we have 5% here, 10% here. So the remaining 85% of the carbon dioxide will combine with water and by the enzymatic activity of the special enzyme we call carbonic anhydrates, the carbonic anhydrates will catalyze the conversion of these two molecules into carbonic acid.