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Conditioned culture media were absorbed onto carbon-coated grids, negatively stained with 1% uranyl acetate, and visualized by electron microscopy. The displayed images are representative images of (A) fresh medium, (B) 4T1-conditioned medium, (C) HC11-conditioned medium, (D) sonicated 4T1-conditioned medium, and (E) sonicated HC11-conditioned medium.
