#hemoprotein__haemoprotein  a conjugated protein linked to an iron-porphyrin compound
  supertype:  conjugated_protein__compound_protein  a protein complex combining amino acids with other substances
  subtype:  hemoglobin__haemoglobin__Hb  a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues; "fish have simpler hemoglobin than mammals"
     subtype:  oxyhemoglobin__oxyhaemoglobin  the bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs; "oxyhemoglobin transports oxygen to the cells of the body"
  subtype:  myoglobin  a hemoprotein that receives oxygen from hemoglobin and stores it in the tissues until needed
  subtype:  cytochrome  a class of hemoprotein whose principle biological function is as carriers of electrons
     subtype:  cytochrome_c  the most abundant and stable cytochrome; involved in energy transfer

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