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Cornea transplantation is outstandingly successful because:

1. cornea is easy to preserve
2. cornea is not linked up with blood vascular and immune systems
3. the technique involved is very simple
4. cornea is easily available

Correct answer: cornea is not linked up with blood vascular and immune systems

Solution

Corneal grafts succeed unusually well because the cornea is avascular and relatively isolated from the immune system, so immune rejection is much less likely. This immune privilege is the key reason, not preservation, simplicity, or availability.

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