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Fig. 3. Changes in the surface area of chloride cells in the yolk-sac membrane of intact tilapia embryos (A) and yolk-ball preparations (B) incubated in fresh water (FW) and sea water (SW). Values are expressed means ± S.E.M. (N=4 samples). Asterisks indicate significant differences between freshwater and seawater groups (P<0.05).