And these plasma cells form a bunch of these antibodies that can now move around our blood system and lymph system and they combine to the antigens of this bacterial cell. Now, memory B cells, instead of forming these antibodies they essentially store these antibodies within the cell and they can essentially react with a bacterial cell of the same type that reinfects our body at some later time. So it's the memory B cells that essentially allow our immune system to be adaptive. It allows the adaptive immune system to actually learn from these pathogens that infect our cells of the body. And finally, our T cell differentiates into the cytotoxic T cell and this contains the CD eight glycoprotein on the membrane. Now, the CD eight glycoprotein basically is responsible for binding to the MHC class one, the major histocompatibility complex class one.