thymus

A similar study looked at the thymus – a small organ involved in training the immune system.

Plus a tweak: The donor pig’s thymus gland, which trains the immune system, was attached to the donated kidney in hopes that it would help Pisano’s body tolerate the new organ.

“Later, after the game, I confirmed that I have written specifically about what’s called ‘involution of the thymus’ on my blog in October 2018.

Epithelial cells in the thymus present a large number of molecules that occur in the body to the future T cells.

To prevent these incidents of "friendly fire," T cells developing in the thymus gland need to first be educated to discriminate between the body's own proteins and those of foreign origin.