Macroscopic findings of the surface of the implanted and control sites. In animal no. 1, the surface of the implanted defect was covered with the abundant cartilaginous white tissues (A), whereas the cartilaginous tissue was scarce and the surface was depressed in the control site (B). In animal no. 2, the surface was more uniformly covered with abundant cartilaginous white tissues and the boundary to the surrounding normal cartilage was unclear in the implanted site (C), comparing to those of the control site (D).