Well, helper T cells help differentiate other cells of our immune system and they also release special types of chemicals known as interferons as well as interleukins. And these chemicals are involved in differentiating our cells as well as in promoting the process that defends our body from pathogens. For example, we know that helper T cells help differentiate the B lymphocytes into these plasma cells and memory B cells. 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.