Now, one example of a T cell that contains a CD eight glycoprotein is the cytotoxic T cell, also known as the killer T cell. That is part of the cell mediated immunity. So cytotoxic T cells are example of CD eight plus T cells. The plus simply means these cells have this glycoprotein. Now, generally speaking, these cytotoxic T cells and all CD eight T cells are those cells that can differentiate infected cells from healthy cells and kill off those infected cells. So, to see what we mean, let's consider the following example.