And what that implies is because the wide blood cells cannot get to these immunologically privileged sites then the self antigens found on the cells of these immunologically privileged sites basically are not recognized by the white blood cells. So certain places of our body are out of reach to the majority of our white blood cells because they contain virtually no blood vessels or no lymph vessels. And two examples are our cornea in the eye as well as our brain. So when some type of physical damage takes place on these immunologically privileged sites for example, somebody punches us in the eye the self antigens might actually get somehow into our blood system or into our lymph system. And when these self antigens begin to circulate inside our blood because the white blood cells have never actually encountered these self antigens they will see them as pathogenic antigens and they will begin to produce plasma cells that produce antibodies that bind to these self antigens and destroy those self antigens. And what will happen is these wide blood cells and antibodies will move into the eye and will begin to destroy not only this eye that experience that physical damage but also the other eye because the other eye contains those same types of self antigens.