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. But we have a pretty good idea. Well, since these T cells do not actually bind onto the MHC class one or the MHC class two regions of these antigen presenting cells such as macrophages dendritic cells and B lymphocytes, that implies that gamma delta T cells do not actually depend on these antigen presenting cells to carry out their immune defensive response. So, although their function and mechanism of action is still not very well understood, they are believed to be part of the first line of defense and team to react faster at a quicker rate than our AlphaBeta T cells do.