Assertion: hemoglobin's subunit | /r/CapableOf | decrease the degree of α-subunit excess
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Source sentences:
text: The δβ-thalassemias are associated with total deficiency of β-globin subunit production, but are clinically milder than typical cases of β0-thalassemia, because there is an associated persistent high level of expression of the γ-subunit of fetal hemoglobin that decreases the degree of α-subunit excess.