And this is the diagram that describes this complex, this protein complex found on the cell membrane of a healthy cell. So we essentially have four different polypeptide units that are connected as shown. And we have alpha one, alpha two, alpha three, beta two subunits. 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.