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The amount at each time points of (a) PDGF‐AB, (c) VEGF over a 7‐day period. The total amount of GFs released over a 7‐day period for (b) PDGF‐AB, (d) VEGF. GF, growth factor; PDGF‐AB, platelet‐derived growth factor‐AB; VEGF, vascular endothelial growth factor. (p value: *p < .05, **p < .01, ***p < .001)
