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Ca2+ oscillation by anisotropy change of W-Cameleon. (a) Time trajectory of W-Cameleon anisotropy change. Standards deviations (σ), 1σ (68%), 2σ (95%) and 3σ (99.7%) lines were calculated by using the data points before histamine stimulation. (b) Ratio image of W-Cameleon. Scale bar is 20 μm.
