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Invasion assay of these four subsets of MCF7 cells. A, Cell number quantification of invasion. B, Confocal images of these four subsets of MCF7 cells (Green: CD44+/CD24-/low; Red: CD44-/CD24+; Yellow: CD44+/CD24+; and Blue: CD44-/CD24-). C, Quantification of tumor cell migration distance. D, Images of cell migration distance.
