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Growth factor and cytokine expression profile of contractile collagen gels (CCG), Integra (I), Matriderm (MD), and Smart Matrix (SM) at days 2 and 7 of culture as percentage of monolayer control (*p=0.027). TNFα, tumor necrosis factor alpha; IGF1, insulin-like growth factor 1; VEGF, vascular endothelial growth factor; IL, interleukin; bFGF, fibroblast growth factor b; TGFβ, transforming growth factor beta; EGF, epidermal growth factor.
