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In vitro cell counts measured for MC3T3 cells incubated in PDGF releasates from (A) PUR/PDGF scaffolds, (B) microspheres incorporating PDGF, (C) granules, and (D) PUR/G-PDGF scaffolds. MC3T3 cells were treated with varying dosages of PDGF (0, 3, and 10 ng/ml) for 24 and 72 hours after attachment of the cells to the surface of the well plates. The control treatment comprised fresh PDGF. CyQUANT assay was carried out to measure cell number.
