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Twenty Years of Calcium Imaging: Cell Physiology to Dye For
Figure 1.
Calcium sparks. These signals are spontaneous, transient, small bursts of sub-membrane Ca2+ originating from clusters of Ca2+-release channels on the sarcoplasmic reticulum (Ca2+ stores) as shown here for an isolated vascular smooth muscle cell at 4 time points (>500 ms apart).
