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| biopax3:comment |
Aquaporin-9 (AQP9) passively transports water, glycerol, urea, and some other small neutral solutes across the plasma membrane according to the osmotic gradient. AQP9 is expressed in the sinusoidal plasma membrane in the liver facing the portal vein where it is believed to be responsible for glycerol uptake as part of gluconeogenesis. AQP9 is also expressed in glia, neurons, and peripheral leukocytes.
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