Now let's move on to hemoglobin. Notice, unlike hemoglobin, unlike my globin, the curve for hemoglobin is not as sharp. In fact, we have this s shape curve, and this s shape is known as the sigmoidal shape curve. And what the sigmoidal shape curve basically means is the binding affinity of hemoglobin for oxygen is much smaller than that for myoglobin. So we said earlier that a concentration of only 2 mercury is needed to actually bind 50% of that myoglobin to oxygen. Now, in the case of hemoglobin, if we draw a straight line from the 50% mark, from the 0.5 mark, and we draw a vertical line down, this will give us a partial pressure of about 26 mercury.