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Properties: reddish-brown powder, it is an iron-containing complex allosteric protein of vertebrate red blood cells. It is composed of heme and globin, with globin accounting for about 96% and heme accounting for 4%. It contains four polypeptide chains, each of which contains a heme group. Iron in heme is divalent. When combined with oxygen, its chemical valence remains unchanged to form oxyhemoglobin. Bright red, with a bluish tinge after dissociation from oxygen Uses: biochemical studies. Can break cell walls.