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(a) Calcium influx into ND7/23 and HeLa cells when exposed to a laser source (808 nm, 133 mW, ∼68 μW μm−2). The irradiated site is marked with a red circle. White squares show the analysed fluorescent intensity areas. Scale bars, 50 μm. (b) Quantification of fluorescence intensity over time. (c) Response to multiple laser irradiation events.
