There are major differences in the temperature dependence of the Mössbauer spectra of ferritin and haemosiderin extracted from the organs of humans suffering from transfusional iron overload. Iron overload can also occur in animal systems as a result of artificial treatments or dietary factors. None of the animal systems which were investigated in the present study showed evidence in their Mössbauer spectra for the presence of the haemosiderin found in transfusional iron overload in humans. This suggests that the haemosiderin which occurs in the case of human transfusional iron overload may be specific to that situation.
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