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Endogenous Stac3 in myotubes eliminates Ca2+-dependent inactivation of heterologously expressed CaV1.2. Superimposed peak Ca2+ (red, vertically scaled by indicated factor) and Ba2+ (black) currents (A) and R150 vs test potential (B) are shown for dysgenic (CaV1.1-null) myotubes expressing YFP-CaV1.2. In A, test potentials were +30 mV and +10 mV for Ca2+ and Ba2+, respectively. Scale bars: 10 pA/pF (unscaled Ba2+ currents, vertical) and 50 ms (horizontal).
