And only then can some type of T cell T lymphocyte with this CD four Glycoprotein bind onto this MHC class Two complex that contains air antigen. And once this binding takes place, that ultimately stimulates this B lymphocyte to undergo mitosis divide. Many times and it basically differentiates into two different types of cells the plasma cells that basically produce the antibodies found inside our blood, swimming around our blood and lymph system. And they also produce those memory B cells that are involved if reinfection ever actually takes place. So once again, we can conclude that the antigen presenting cell is a type of cell of our body that allows these T lymphocytes to actually interact with the antigens. What these cells do is they engulfed these antigens and then they build these special protein complexes and then they take that antigen and place it on that protein complex.