The mechanism of graft rejection characterized by immediate graft failure due to pre-formed recipient antibodies binding to donor antigens is Hyperacute Rejection. This severe and rapid form of rejection occurs when the recipient possesses pre-existing antibodies, which are immune proteins developed in their bloodstream prior to transplantation. These antibodies are often generated from previous exposures, such as prior blood transfusions, pregnancies, or previous organ transplants. Upon reperfusion, meaning when blood flow is re-est....
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