The UTP-evoked KCa3.1 current activation involves Ca²⁺ entry and Ca²⁺-release activated Ca²⁺ (CRAC) channels.

<p>The current was evoked by UTP in separate MLS-9 cells with Ca²⁺-free bath solution (<b>A</b>), or with either 50 µM 2-APB (<b>B</b>) or 10 µM BTP2 (<b>C</b>) in the bath. <b>D.</b> The amplitude was quantified (as in Fig. 1E) and compared with standard bath solution. The number of cells is indicated on each bar. ***<i>p</i><0.001