Now, memory B cells help our immune system with learning and the plasma cells produce our antibodies that basically float and circulate around our blood system. Now, what the helper T cells also do is they also help differentiate T lynthesize into a special type of soldier cell we call the killer T cell or the cytotoxic T cell. Now, these cytotoxic T cells basically travel to the infected area and they can use the antibody found on their cell membrane and bind to special antigen portions, specific antigen portions found on the infected cell or pathogen cell. And they can basically release these very powerful proteins, proteolytic proteins that essentially drill holes inside those infected cells, killing those cells. And these powerful proteins are known as perforance. So basically the T lymphocy, with the help of the helper T cell differentiates into these soldiers cytotoxic T cells that contain these receptors.