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. 1997 Feb 1;109(2):229–243. doi: 10.1085/jgp.109.2.229

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Changes in the outward I-V relation of whole-cell IRK1 while extending the duration of voltage steps in the presence of internal Mg²⁺ or Put. (A) I-V relations obtained at the end of 20-ms (○) and 500-ms (▪) voltage steps applied from −80 mV at 15.4 mM K_o, 1.1 mM Mg_i. (B) I-V relations obtained with 500 μM internal Put at the end of 20-ms (○), 50-ms (▴), and 500-ms (▪) voltage steps from −110 mV at 5.4 mM K_o.