Organ transplant

An organ transplant is the moving of an organ from one body to another, or from a donor site on the patient's own body, for the purpose of replacing the recipient's damaged or absent organ.

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  cornea
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  Saints Cosmas and Damianmiraculously transplant the (black) leg of a Moor onto the (white) body of Justinian.
  Ditzingen, 16th century.