A water channel. Aquaporins form pores in the membranes of cells and selectively conduct water molecules through the membrane, while preventing the passage of ions (such as sodium and potassium) and other small molecules. Aquaporins are typically composed of identical subunit proteins. Water molecules traverse the narrowest portion of the water cha [..]

A transport protein in the plasma membranes of a plant or animal cell that specifically facilitates the diffusion of water across the membrane (osmosis).

Any one of a group of proteins in cell membranes that allow the passage of water across the membrane. Aquaporin is found in the astrocytic foot process on the nervous system side of the blood-brain barrier. Aquaporins balance water transport across the blood-brain barrier.

<protein> Plant cell wall polysaccharides containing predominantly arabinose and galactose. Two main types are recognised: arabinogalactan 1, found in the pectin portion of angiosperms and containing alpha (1-4) linked galactan and _ arabinose side chains, arabinogalactan II, a highly branched polymer containing _(1-3) and _ (1-6) linked gala [..]