B lymphocytes are those cells of our antibody mediated response system of our adaptive required immune system. So these B lymphocytes are essentially responsible for creating antibodies, these proteins that essentially travel inside our blood system and which help play an important role in actually protecting us from infection. So belymphasize, our cells that are part of the antibody mediator response system they further differentiate into plasma cells as well as memory cells. 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.