'''Hemoglobin''' is the iron-containing [[protein]] in red [[blood]] cells that carries oxygen to the [[cell|cells]] of the body. The iron component in hemoglobin gives it a red color when carrying oxygen.
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'''Hemoglobin''' is the iron-containing [[protein]] in red [[blood]] cells that carries oxygen to the [[cell]]s of the body. The iron component in hemoglobin gives it a red color when carrying oxygen.