Fig. 3.
Histological analysis of tendon healing at 30 days from injury/start of treatment. a The injured Achilles tendons were then stained with H&E for each type of treatment, and the quality of tendon repair was evaluated based on properties displayed. [CF (cartilage formation), V (vessel); SCF (slight cartilage f)] (× 500). b longitudinal sections of the right hind limb rat Achilles tendons stained by Picro-Sirius red staining (PSR): (magnification × 4, scale bar = 500 μm). The thicker, mature collagen fibers appear red-orange (type I collagen); the thinner collagen fibers appear pale green (type III collagen)