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Fig. 8. The influence, in stingrays acclimated to ion-poor Rio Negro water, of (A) amiloride (10-4 mol l-1), (B) HMA (4x10-5 mol l-1) and (C) phenamil (4x10-5 mol l-1) on net ammonia flux rates (Jamm). Values are means ± 1 S.E.M. (N=5). Other details as in the legend of Fig. 4.