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Hemosiderin collects throughout the body in hemochromatosis. Hemosiderin deposition in the liver is a common feature of hemochromatosis and is the cause of liver failure in the disease. Deposition in the pancreas leads to diabetes and in the skin leads to hyperpigmentation.
When adenosine enters the circulation, it is broken down by adenosine deaminase, which is present in red cells and the vessel wall. Dipyridamole, an inhibitor of adenosine nucleoside transporter, allows adenosine to accumulate in the blood stream. This causes an increase in coronary vasodilatation.