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. 2000 Jun 20;97(13):7260–7265. doi: 10.1073/pnas.97.13.7260

Figure 2.

Figure 2

Ca2+ CRET activities on cellular extracts. Emission spectra of aequorin and several GFP-aequorin fusion proteins were calibrated as a percentage of maximum intensity. CRET measurements are expressed as the ratio of green (500 nm) over blue (450 nm) photons.