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The function of the immunological barrier in the epididymis is to protect the sperm from attack by the immune system. Primarily, this function is carried out by the BEB, which sequesters sperm antigens and restricts entry of immunoglobulins and immune cells (Fig. 2 B).
The brain is protected from harmful substances in the bloodstream by a barrier called the blood-brain barrier, which keeps some of the substances out of the brain entirely and delays the entry of others for hours or even days after they have penetrated the rest of the body. Projection areas of the brain.