So for example, we have some type of inactivated helper T cell that contains the CD four glycoprotein on the membrane goes on and binds onto this complex of the macrophage. And once this binding process takes place that ultimately activates the helper T cell. And that also releases many different types of chemicals involved in our immune system and that activates T cells. For example, it produces cytotoxic T cells. It also activates our B cells into plasma cells and memory B cells. And that begins the process of defending and protecting our body from these pathogens.