Time course study of fibrin-based constructs with and without TGF-β1 supplementation during incremental strain amplitude cyclic stretching a: UTS, b: Modulus, c: Collagen concentration, d: Elastin concentration, e: Cell concentration, and f: Collagen/Cell concentrations after 2, 5 & 7 weeks of incubation. In all cases where error bars are not overlapping, the means are different (p<0.05); for groups with overlapping error bars, a difference (p<0.05) between means is shown with paired symbols.