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Cellular proliferation assay. Stem cells were cultured on the scaffolds in the presence of fetal bovine serum (FBS) or platelet lysate (PL). Although the MTS assays indicated that the cells continued to proliferate beyond day 14 (A), the cells were not able to be trypsinized off the scaffolds beyond day 5, possibly indicating their attachments were resistant to trypsin (B). Color images available online at www.liebertpub.com/tea
