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Relative levels of p53, MDM2 and MDMX protein in four individual MCF7 cells. The y-axis is the number of p53, MDM2 and MDMX protein molecules divided by their corresponding steady-state levels without DNA damage: 104 (p53), 5.6 × 104 (MDM2) and 8.7 × 104 (MDMX) molecules per cell (Wang et al., 2007). DNA damage starts at 4 hours and ends at 54 hours.
