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A diagram of a haemoglobin molecule showing four globin chains, here conventionally arranged at the four corners of a square. Each globin chain is a folded, elongated “sausage” in a different shade of blue. Attached to each globin chain is a haem moiety, shown as a yellow disc with “Fe” (iron) on it. The globin chains are labelled α1, α2, β1 and β2.

 4.2 Haemoglobin