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====Structure====
====Structure====
Haemoglobin is composed of globin and four haem groups which contain an iron atom in each haem group. Four oxygen molecules can bind to each haemoglobin - one to each heam group via the iron when in its ferrous state.
=====Globin=====
=====Globin=====
Globin is composed of two polypeptide groups each composed of two polpeptides chains. The chains are identical within the group, but differ between the groups. Globin varies between species and individuals within a species due to changes in the polypeptide chain sequence.
Globin is composed of two polypeptide groups each composed of two polpeptides chains. The chains are identical within the group, but differ between the groups. Globin varies between species and individuals within a species due to changes in the polypeptide chain sequence.