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Alizarin red stain of PETA:HA as a function of scaffold composition, media treatment, and time. (A) Quantitative analysis of staining on scaffolds loaded with hASCs and cultured in stromal and osteogenic media for 7, 14, and 21 days. (B) Cross-section of each type of scaffold stained with alizarin red on 21 days. Color images available online at www.liebertpub.com/tea
