And the alpha three is connected to the cell membrane of our cell. Now, what exactly is the purpose of the MHC class one complex? Well, basically this is the major histocompatibility complex that actually allows the leukocytes, the white blood cells of our body, to distinguish the healthy cells of our body from the infected cells of our body. Those cells that were infected by some type of pathogen, some type of virus or some type of parasite. Now, most cells in our body that are nucleated, which contain a nucleus have the MHC class one complex. So let's actually discuss how this complex works.