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Effect of supernatants from PEE-conditioned C2C12 cells on macrophage migration. (a) Representative microscopic images of the RAW264 macrophages treated with supernatant from C2C12 cells treated with PEE or vehicle for 8 h. Scale bars represent 200 μm. (b) Quantification of macrophage migration based on the wells' fluorescent intensity (means ± SD of four wells). ∗ P < 0.05 versus supernatant from vehicle-conditioned control cells.
