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A and B, tension and fura PE-3 F340/380 fluorescence ratio, respectively, measured simultaneously in a single IPA under control conditions and in the presence of 1 and 100 μM La3+. C and D, mean results for five IPAs: control, ○; 1 μM La3+, •; and 100 μM La3+, ▪. * P < 0.05, ** P < 0.001 compared to control.
