Cornea transplant in humans is almost never rejected. This is because

Cornea transplant in humans is almost never rejected. This is because
  1. It is a non-living layer
  2. Its cells are least penetrable by bacteria
  3. It has no blood supply
  4. It is composed of enucleated cells

Solution

Cornea can be easily transplanted because it has no blood supply \& therefore, does not involve immune response.

Asked in: NEET 2008 (Mains)

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