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Comparison of MTT assay and BLI for measurement of cell viability under normal culture condition. 1A: correlation between absolute cell number and light signal intensity; 1B: a representative bioluminescent image of cells at various intensities; 1C: correlation of the absorbance at 560 nm and absolute cell number; and 1D: close correlation between MTT assay absorbance and bioluminescent signal intensity.
