| http://www.w3.org/ns/prov#value | - The arrows point to examples of cells that are transfected with the caspase-3 sensor, in which the apoptosis status can be imaged using FRET. (D) Using the system shown in B, IVM images of CFP and YFP are acquired upon CFP excitation and FRET is expressed as a ratio of YFP over CFP (see color bar on the right).
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