So we have these alpha helixes. This is the heme group, and this is an oxygen atom. So the oxygen can either be bound to that heme group or it can be unbound. 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.