In fact, these gamma delta T cells are believed to be involved with immuno surveillance. And what that means is basically swimming around the epithelial tissue of our body and making sure that everything is working correctly and no pathogen is found inside those regions of the body. So we see that the antigens to which these gamma delta T cells actually bind to are not only found on the actual pathogen, for example, our bacterial cell, but they are also found on infected cells of our body. For example, if we have some type of epithelial cell that is infected, for example, this cell, what the infected cell does is it displays an antigen on the membrane of that cell. And our gamma delta T cell can use the gamma delta T cell receptor to bind onto that antigen. And once bound, it basically begins to release special chemicals we call cytokines.