I can see a difference in the density of my cells, why doesn’t the viability assay reflect the difference?

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Check to make sure your cell densities are in the linear range of the cell viability assay. Too few cells may fall below the limit of detection, and too many cells may saturate the OD. Perform an initial experiment to check the best linear range for your cell type and experimental set-up. You may need to vary the cell density assay incubation time. The kit protocols provide general guidelines and may need to be optimized for your experimental system.

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