Assertion: hemoglobin's affinity | /r/HasProperty | two gamma chains
Facets:
Source sentences:
text: Fetal hemoglobin (HbF) is structurally different from normal adult hemoglobin (HbA), giving HbF a higher affinity for oxygen than HbA. HbF is composed of two alpha and two gamma chains whereas HbA is composed of two alpha and two beta chains.