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a Representative bioluminescence and fluorescence images of a mouse subcutaneously injected with 5 × 104, 1 × 105, 2.5 × 105, and 5 × 105 HEK-293 cells expressing TurboLuc (on the left) and 5 × 102, 5 × 103 cells (on the right). Bioluminescence measurement allowed detecting 5 × 103 cells while fluorescence imaging, 5 × 104 cells. b Graph showing the linear correlation between luminescent signals and the number of injected cells
