And these white blood cells eventually differentiate into different types of specialized cells that are used by our immune system for different purposes. And one of these cells is the T cell, also known as the T lymphocyte, where the T actually stands for thymus. So inside the bone marrow, we produce cells called arithmicides. And these thymicides are eventually carried into our thymus. And inside the thymus, the thymus uses our hormone thymicine to basically test the immunity response of our T cells of arithmeticides. Now, if the thymicides fail the test, if they're not able to actually detect the proper antigens, the proper viral agents, in that case the Thiamas, destroys our cells.