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Fig. 7. H2O2- and ABA-activated ICa currents are Na+ permeable in guard cells. (A) Whole-cell current recordings without (no ABA) and with 50 µM ABA (+ ABA) in the same guard cell bathed in 200 mM NaCl. (B) Average Na+ currents at –196 mV show that both ABA and H2O2 activated inward Na+ currents in Arabidopsis guard cells (H2O2, n = 7 cells; ABA, n = 6 cells).
