56. Fetal hemoglobin has a higher affinity for oxygen. What is the critical amino acid difference between the β-chain (adult) and the γ-chain (fetal) of hemoglobin?
(A) 613028d25d464.jpg
(B) 613028db09907.jpg
(C) β-chain: 613028e38d6f6.jpg
(D) 613028ea90e22.jpg

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統計： A(1), B(0), C(4), D(0), E(0) #2769054