And what that does is it activates that helper T cell. Now, once it's activated, it basically releases from this macrophage and it moves on and it finds a B Lymphocyte. Now, remember, B Lymphocytes are part of our adaptive immune system, just like these helper T cells are. But the B Lymphocytes are part of the humoral immunity of our adaptive system while our T Lymphocytes and our helper T cells are part of the cell mediated immunity. So we see that the humoral immunity and the cell mediated immunity interact with one another to carry out the same exact function, to basically kill off these pathogens and kill off the infected cells of our body. So once we activate that helper T cell, it basically goes on and finds a B Lymphocyte that contains the MHC class two, class two complex along with that same antigen that was found on this macrophage.