Fig. 1From: Ozone induces autophagy by activating PPARγ/mTOR in rat chondrocytes treated with IL-1βRat chondrocytes morphological observations. A Toluidine blue staining chondrocytes were observed under the inverted phase contrast microscope at magnifications of 20×; B More than 95% of the cultured cells showed positive expression of type II collagen under a fluorescence microscope at 20×magnificationBack to article page