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Orai channels are required for store-operated Ca(2+) entry (SOCE) in multiple cell types. Septins are a class of GTP-binding proteins that function as diffusion barriers in cells. Here we show that Septin 7 acts as a 'molecular brake' on activation of Orai channels in Drosophila neurons. Lowering Septin 7 levels results in dOrai-mediated Ca(2+) entry and… (More)