Remember, self antigens are proteins found on the healthy cells of our body. And if those T lymphocytes bind onto these healthy self antigens, then the binding process will initiate apatosis and those T cells will be killed off. The reason is if the T cells actually bind onto cell antigens, that means those T lymphocytes will begin to kill off the healthy cells of our body. And we don't want this. We don't want to cause a condition known as autoimmunity. And so what happens in the thiamine?