And what that means is the fetal hemoglobin will be much more attractive to the oxygen. And that's important because it needs to be able to effectively and efficiently take the oxygen from the mother's blood and deliver it into the blood system of that developing fetus. Now, if we examine the oxygen binding curve we see that this green curve basically describes the oxygen binding curve for the fetal hemoglobin while the blue curve describes the oxygen binding curve for the hemoglobin found in the mother's blood, the normal hemoglobin. And we see that our blue curve is shifted to the right with respect to the green curve. And that makes sense because what that means the blue curve, the regular hemoglobin has a slightly lower affinity than this green curve than the fetal hemoglobin. So the fetal hemoglobin, at the same partial pressure will be able able to buy more oxygen than that mother's normal hemoglobin.