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Fig. 6. The effects of tetracaine on InsP3-evoked [Ca2+]i transients and STOCs. (A) At a holding potential of -10 mV (iii) InsP3 ({uparrow}) increased [Ca2+]i; tetracaine, an inhibitor of RyR did not reduce the InsP3-evoked Ca2+ transient (Ai,ii), although it inhibited STOCs (B).