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. Well, a healthy cell will bind one of its normal proteins, peptides that it creates inside the cell onto this clef portion of our MHC class one complex. So if we take a look at the following diagram, we have a healthy cell of our body. We have our major histocompatibility complex, class one.