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. 2004 Feb;123(2):167–182. doi: 10.1085/jgp.200308982

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Copyright © 2004, The Rockefeller University Press

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Figure 7. — Store-operated current carried by Na⁺ in divalent-free solution. Pipette solution 9. (A) Time course of currents after development of Ca²⁺ current with 2 mM external Ca²⁺ (□), and during subsequent exposure to divalent-free Na⁺-containing solution (▪; solution 7). (B) Corresponding Ca²⁺ and Na⁺ I-V curves. (C) Cs⁺ does not carry measurable monovalent current. After development of Ca²⁺ current (□), transient inward currents upon divalent withdrawal were only seen with Na⁺ (▪; solution 7) but not Cs⁺ (gray square, solution 8). (D) Corresponding I-V curves.