Longitudinal section of distal femur indicating the region of interest (black box and yellow box for synovium and cartilage, respectively) (A); synovium was stained with H&E (scar bar = 100 μm) (B), and the histopathological score was evaluated at 4, 8 and 12 weeks post-transplantation (C).

<p>Longitudinal section of distal femur indicating the region of interest (black box and yellow box for synovium and cartilage, respectively) (A); synovium was stained with H&E (scar bar = 100 μm) (B), and the histopathological score was evaluated at 4, 8 and 12 weeks post-transplantation (C).