Fig. 4. Quantification of the radiolabelled AQP3 DNA probe bound to northern blots of gill and intestinal RNA samples isolated from freshwater (FW)- and 3-week seawater (SW)-acclimated yellow or silver eels (as shown in Fig. 3). Values are means ± S.E.M. NS, not significant P>0.05; ^**P<0.01; ^****P<0.0001; these values indicate FW to SW comparisons, where N=6 samples from different fish in each group.