Biochemical results for MSCs cultured on plain polymer scaffolds (PCL) and composite scaffolds (PCL/ECM) either with (+) or without (−) the addition of TGF-β1. Plots show cellularity (A), glycosaminoglycan content (B), and glycosaminoglycan synthetic activity (C), as mean ± standard deviation for n = 3 from one experiment, although similar trends were observed in two independent experiments. Within a specific treatment group, significant difference (p < 0.05) between time points is noted with (#). At a specific time point for each scaffold group, significant difference (p < 0.05) compared to −TGF-β1 controls is noted with (*). At a specific time point for each growth factor treatment group, significant difference (p < 0.05) compared to PCL controls is noted with (**).