Glycated hemoglobin is not a single molecular entity.
There are many various molecular species in human
blood, resulting from the many potential glycation sites
at the hemoglobin molecule, the different molecular forms
of human hemoglobin such as HbA0 (α2-β2), HbA2 (α2δ2),
HbF (α2γ2), and the numerous hemoglobin variants (e.g.,
HbS, HbC, HbE )