Difference between the two iron-binding sites of transferrin.
D001665:Binding Sites; D055598:Chemical Phenomena; D002621:Chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000378:metabolism*; D007504:Iron Radioisotopes; D014168:Transferrin / Q000378:metabolism*
D007504:Iron Radioisotopes; D014168:Transferrin; D007501:Iron