Biology:Aquaporin-9

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A representation of the 3D structure of the protein myoglobin showing turquoise α-helices.
Generic protein structure example

Aquaporin-9 (AQP-9) is a protein that in humans is encoded by the AQP9 gene.[1]

The aquaporins/major intrinsic protein are a family of water-selective membrane channels. Aquaporin-9 has greater sequence similarity with AQP3 and AQP7 and they may be a subfamily. Aquaporin-9 allows passage of a wide variety of noncharged solutes. AQP-9 stimulates urea transport and osmotic water permeability; there are contradicting reports about its role in providing glycerol permeability. Aquaporin-9 may also have some role in specialized leukocyte functions such as immunological response and bactericidal activity.[1]

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This article incorporates text from the United States National Library of Medicine, which is in the public domain.