Now, plasma cells are those B lymphocytes that produce the antibodies and the memory cells are those cells that essentially store those antibodies and help us protect us from reinfection. So if some bacterial cell infected us once it's the memory cells that essentially protect us the second time. Those same cell types will infect us. Now, what about the T lymphocytes? So B lymphocytes and T lymphocytes basically look something like this. We have our membrane and on the membrane we have these different types of proteins that act as receptors for antigens.