Fig. 4
From: Auricular cartilage regeneration using different types of mesenchymal stem cells in rabbits
Gross observation of all groups on postoperative days 0, 3, 7, 14, 21 and 28 showed that: 4 weeks after injection of different types of stem cells. All the defects were completely healed by chondrocytes with smooth surface and similar color with the surrounding tissue in the experimental groups (A ADMSCs, B BMMSCs and  C EMSCs). The defect of the control group (D) persisted thin, presenting no chondrocyte propagation around the damage