... Inc.fusionpointsoftheNPEcellsblockfurthermovementofHRPintotheposteriorchamber(Schlingemannetal. ,19 98).Gapjunctionsareubiquitousintheciliarybodyepithelium,connectingPE-to-PE,NPE-to-NPF,andPE-to-NPEcells(Freddo ,19 87)(Fig.6).ThegapjunctionsbetweenPEandNPE ... formation of aqueous humor(Caprioli, 19 92). Na+/K+-ATPase (Usukura et al., 19 88; Okami et al., 19 89; Martin-Vasallo et at., 19 89), H+/K+-ATPase (Fain et al, 19 88) andactive ascorbate transport ... prodrug-converting enzyme. J. Pharm. Sci. 81: 113 11 6, 19 92.37. M. Hu, P. Subramanian, H. I. Mosberg, and G. L. Amidon. Use of thepeptide carrier system to improve the intestinal absorption of L-alpha-methyl-dopa:...