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(a) SEM photos of monolayer control (day 2), contractile collagen gel (day 7), Integra (day 2), Matriderm (day 2), and Smart Matrix (day 2) cultured with normal human dermal fibroblasts. (b) Hematoxylin and eosin (H&E) staining of 4-μm cross-sections of the different matrixes cultured with normal human dermal fibroblasts for 2 and 7 days. Black arrows point at cells with elongated morphology.
