Ordinarily, it is not possible to transplant tissues from one person to another without rejection, yet corneas can be transplanted with impunity. This is because the cornea

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The cornea has no blood supply except around the periphery, making it an immune privileged tissue that is not recognized as foreign by the recipient's immune system. The lack of blood supply also reduces the chance of rejection, as there are no blood vessels for the recipient's immune cells to attack the transplanted tissue.

Ordinarily, It Is Not Possible to Transplant Tissues from One