In this particular case, the oxygen is bound to that heme group. Now, what the alpha hemoglobin stabilizing protein does is it actually binds onto this alpha polypeptide chain on the same region of that alpha unit as where the beta unit would bind. And when the alpha hemoglobin stabilizing protein binds onto this alpha unit monomer, it forms a dimer complex that is more stabilized than when it exists in its individual form. And it is also soluble in the blood plasma. And by forming this complex, it basically prevents the aggregation and the precipitation of those alpha unit complexes. And this prevents many, many problems.