Fig. 4
From: Platelet-rich fibrin prepared from stored whole-blood samples
Bioactivities and PDGF-BB concentrations in PRF extracts and the supernatant serum fraction. a PRF extracts were added to periosteal cell cultures and incubated for 3 days to evaluate their effects on cell proliferation. No significant differences were observed among three groups. b PRF extracts were subjected to measurement of PDGF-BB levels using an ELISA kit. No significant differences were observed in the supernatant among three groups. N = 6. c Representative localization of supernatant serum fraction of PRF preparation just after centrifugation