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Carrier-mediated transport enables molecules with low lipid solubility to traverse the blood-brain barrier. Glucose from blood enters the brain by a transport protein. Glucose is the primary energy substrate of the brain. Glucose transport protein (GLUT-1) is highly enriched in brain capillary endothelial cells. These transporters carry glucose molecules through the blood brain barrier.
1 NK cells have. 2  activating receptors, that activate the NK cell when it binds to a target cell, and. 3  inhibitory receptors that transmit an inhibitory signal if they encounter class I MHC molecules on a cell surface.erhaps the function of NKT cells is to provide quicker help for a cell-mediated immune response (IFN-Î³) or antibody-mediated response (IL-4) than the several days needed by conventional T-helper cells. If so, NKT cells would represent a link between innate and adaptive immunity.