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Hemoglobin is a [[Tetrameric protein|tetramer]] with four oxygen binding sites. The binding of carbon monoxide a

| image_source = Structure of human hemoglobin. The protein's <font color = "red">'''α'''</font> and <font color = "blue">'''β'''</fo In mammals the protein makes up about 97% of the red blood cell's dry content, and around 35% of t

...</ref> Four identical subunits associate to form a symmetric [[tetrameric protein|tetramer]]. Each of the subunits has six [[hydrophobic]] [[alpha helix|alp In addition, SK potassium channels are tightly associated with the protein [[calmodulin]] which accounts for the calcium sensitivity of these channels