Water permeation and glycerol transport by zebrafish AQP-expression Xenopus oocytes. A. Water osmolarity (Pf) is determined in oocytes that have expressed zebrafish aquaglyceroporin genes. (n = 5 oocytes were used. P < 0.01 is calculated from water control and Aqp injected samples). B. Glycerol transport is determined by applying 0.5 mM [3H] glycerol for 30 min. The standard deviation was calculated using Sigma Plot 10 (n = 7 oocytes were used from same frog, P < 0.01 is calculated from water control and Aqp injected samples).