And then let's briefly discuss what the function of these gamma delta T cells is. So, in the same way that our AlphaBeta T cells are produced in the bone marrow and mature in the thymus, the gamma delta T cells are also produced in our bone marrow and differentiate in our thymus. But these gamma delta T cells actually end up in the tissue of our body that interfaces with the outside environment. And that implies that these gamma delta T cells are found in the epithelial cells, in the epithelial tissue of our body, for example, in our skin, in our lungs, in our intestines, as well as other regions of our body. Now, what about the function? Well, because we don't know too much about these gamma delta T cells, we don't actually know what the exact function of these cells are.