Fig. 7From: Fluid and ion transfer across the blood–brain and blood–cerebrospinal fluid barriers; a comparative account of mechanisms and rolesNet transport by the Cl−-dependent Na+, HCO3 −-cotransporter, NCBE, in the basolateral membrane of the choroid plexus epithelial cells would be equivalent to the transport of 1 Na+ and 2 HCO3 − into the cell and 1 Cl− out. Carbonic anhydrase catalyzes the steps indicated by c.a.Back to article page