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. 1998 Nov 1;112(5):569–576. doi: 10.1085/jgp.112.5.569

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Response to a calcium ramp generated by photolysis. (A) The dynamic response to calcium ramps of identical magnitude but different rates of delivery. (B) The dynamic response as a function of calcium is identical for the two different rates of delivery. For clarity, only every 10th data point is plotted. The solid and open symbols correspond to the faster and slower ramps, respectively. The sample time was 5 ms for fluorescence and light scattering with an offset of 2.5 ms between the two data channels. The data represents the average of six individual trials. The error in % fusion is less than the thickness of the trace (SEM < 1%). The standard error in the averaged calcium values is <0.1 pCa.