| http://www.w3.org/ns/prov#value | - kidneys can come from live dnors, as can some liver portions, bone marrow. but hearts, lungs and other vital organs cannot. they are usually harvested after brain death but with the body kept alive by machine, because the organ starts to die once the blood flow stops and the harvest itself wastes precious time after cardiac death making the organ inviable for transplant.
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