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Sensor responses to HEK-293 cell line. Cells plated at 80 K (lightest colors), 250 K (light colors), 500 K (medium dark colors), and 1 M (darkest colors) cells/dish, measured after withdrawn from the incubator at 24 h (blue), 48 h (green) and 72 h (orange); (a) cells sorted for the same concentration at different times of incubation; (b) cells sorted for the same time of incubation but at different concentrations.
