?? ???? ????? ?? ??? ?? ???? ??? ???? ????? ?????? ?? ??????? ?? ???? ?????? ??? ???? ?? ???? ????? ?? ?????? ???? ?????The endothelial cells during the cerebral blood vessel walls are joined tightly to each other, forming the blood–brain barrier, which blocks the passage of many toxins and pathogens[35] (however at the same time blocking antibod