A kidney transplanted from another person is usually rejected because the recipient's immune system recognises foreign
- A. hormones on the organ
- B. self markers, the MHC proteins, on the donor's cells
- C. digestive enzymes
- D. phospholipids of the membranes
Explanation
Every person's MHC proteins are unique identity tags, and cytotoxic T cells attack any tissue carrying unfamiliar ones. Close matching of MHC between donor and recipient reduces this recognition.