Fig. 7. The inhibition of Na⁺, K⁺-ATPase activity by free ArA in the incubation medium. Values are means ± S.E.M., N=10. Na⁺, K⁺-ATPase activity in 1% methanol was set at 100%. Activities were compared for significance to the activity at 1% methanol and 0 µmol l^-1 ArA (see Materials and methods for details); ^*P<0.05, ^**P<0.01, ^***P<0.001.