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Question

2% of adult globin in humans is made of
  1. ζ2,γ2
  2. α2,δ2
  3. α2,ε2
  4. α2,γ2

A
α2,δ2
B
α2,γ2
C
ζ2,γ2
D
α2,ε2
Solution
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In the normal adult, hemoglobin A, which is composed of two alpha and two beta globins (A2B2), is the most prevalent, comprising about 95% of all hemoglobin. Two minor hemoglobins also occur: hemoglobin A2, composed of two alpha and two delta globins (α2δ2) comprises 2-3.5% of hemoglobin, while hemoglobin F, composed of two alpha and two gamma globins (α2γ2) comprises less than 2% of hemoglobin.
So, the correct answer is 'α2,δ2.'

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