Oxygen affinity of fetal blood is higher than that of maternal blood and may help to provide the fetus with an adequate orygen supply during pregnancy. In mammals, 2, 3-biphosphosphoglycerate (BPG) mediates intracellular hemoglobin function by lowering orygen affinity. Fetal red blood cells have higher affinity for oxygen because of a smaller effect of BPG on oxygen affinity of fetal hemoglobin (Hb F) compared with adult Hb (Hb A). Which symbol shows the PS0 value corresponding to Hb F? 14 12 10 0.5 1.0 1.5 2.0 2,3-BPG (mM) O Circle O Dimond O Square O Triangle 00 (6H ww) d

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