Cloning and functional expression of a new aquaporin (AQP9) abundantly expressed in the peripheral leukocytes permeable to water and urea, but not to glycerol - Ishibashi, K; Kuwahara, M; Gu, Y; Tanaka, Y; Marumo, F; Sasaki, S (Biochem Biophys Res Commun, 1998)