So we see that the major histocompatibility complex, class one is actually responsible for allowing our leukocytes to distinguish our healthy cells from the infected cells of our body. Now, what about the second class? What about MHC Class Two? Well, these are the complexes found on our cells specifically on certain types of immune cells of our body. And these are used predominantly in communication between different types of leukocytes in our body. So these protein complexes are found only on specific immune cells such as B, lymphocytes, macrophages, our dendritic cells.