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(A) Luciferase activity measurement of E1-Rluc8. The proteins were incubated with mouse serum for the indicated times. The light emitted from E1-Rluc8 was measured using a luminometer after treatment with coelenterazine. E1-Rluc8 incubated in boiled serum was used as a control. (B) Fluorescence activity measurement of E1-EGFP. The fluorescence emitted by E1-EGFP was measured using a fluorometer.
