Recall that these antigen presenting cells degrade. They break down the antigens and only display a small portion of that antigen on that MHC complex. But these gamma delta T cells don't have to rely on that single portion of the antigen. They can actually fully bind to a fully intact antigen in the same way that free floating antibodies bind onto fully intact antigens. So gamma delta T cells can bind to any antigen that is not bound to the MHC class one and MHC class two molecules found on other white blood cells. And what that implies is they do not depend on antigen presenting cells to actually carry out some type of immune defense response.