Now, let's move on to our cell mediated immunity. Now, the cell mediated immunity also involves a special type of leukocyte known as the Tea lymphocytes. So belymphocytes are the humoral immunity but T lymphocytes are part of our cell mediated immunity. Now, T lymphocytes also are formed inside the bone marrow but T lymphocytes mature inside the thymus, which is basically a glam found in this region of our body. And what the Thiamis does is it basically checks, it tests these premature T lymphocytes and it ensures that the T lymphocytes don't actually attack our own cells of the body. And that's an important process because if the T lymphocytes do attack the cells of our body, what the thymus does is it ultimately Detroit these T lymphocytes.