It was hoped that time would allow the developing T cells in the thymus to be "introduced" to the donor tissue, so that when they were circulating around the body they would not attack the donor organ.

BBC: 'Drug-free' transplant hope

In a study from India, kidney transplant patients had crushed donor kidney tissue injected into their thymus - the body's "immune engine room" where cells can be "educated".

BBC: 'Drug-free' transplant hope

The surgery transplants a healthy thymus into the body, providing it with the ability to manufacture sufficient T-Cells to fight off infections.

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