Now, as we'll see in just a moment, thyomosin is actually involved in building up our immune system. And that's exactly why we'll focus on the thymus in much more detail and how it actually works when we'll discuss the immune system of our body. Now, unlike other endocrine glands that function in our body which function throughout the entire lifetime of the organism, the thymus is special in that it only functions, it only stays active until about puberty. And after that, the thymus basically begins to break down. It begins to deteriorate and eventually is replaced by our fat cells by out of post tissue. Now, what exactly is the function of the thymus?