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Comparison of the concentration of growth factors between the platelet-rich plasma (PRP) alone and hyaluronic acid (HA) groups (n = 9). (A) The transforming growth factor β1 (TGF-β1) level in the PRP + HA group was higher than that in the PRP group on Day 5. (B) The platelet-derived growth factor (PDGF-AA) level in the PRP + HA group was higher than that in the PRP group on Day 5. * p < 0.005.
