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Surface expression of CXCR4 on CD133+ progenitor cells. Boxplot demonstrating the surface expression of CXCR4 on CD133+ progenitor cells in subjects with stable plaques and subjects with unstable plaques. The top of the box represents the 75th percentile, the bottom of the box represents the 25th percentile, the center horizontal line represents the 50th percentile. The whiskers represent the highest and lowest values.
