<prompt> The most impoant function of Major Intrinsic Protein 26 MIP-26 is:Diffusion barrierCapsule of lensGlucose transpo in lensTranspo of water in lens  <response>: Major Intrinsic Protein 26 MIP-26, now known as Aquaporin 0 is found only in the plasma membrane of eye lens fibre cells. Its main function is to maintain transparency of the lens by maintaining a tight cellular junction andor by water cirulation. Ref: Encyclopedia of Molecular Pharmacology, Volume 1, Springer, 2008, Page 215; Current Medicinal Chemistry Jun 1999, Page 465 