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. 1998 Jun 1;111(6):857–873. doi: 10.1085/jgp.111.6.857

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Lack of effect of phosphoarginine (p-ARG) on NCX-SQ1 exchange current in an excised oocyte patch. After activation of the exchange current by applying Na⁺-containing solution, 5 mM phosphoarginine was applied with 3 mM Mg²⁺ (pH 7.0). There is no stimulatory effect, whereas application of 50 μM PIP₂ strongly stimulates the exchange current to a magnitude more than twofold greater than the peak obtained on applying Na⁺ initially.