Fig. 4.
Redifferentiation capacity of expanded chondrocytes was assessed at the protein level using western blot after chondrocyte-pellets were incubated in a TGF-β1-containing medium for 14 days. Collagen II in the extracellular matrix (mature) and cytoplasm (immature) of chondrocyte-pellets were detected with β-actin as an internal control.