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Histological analysis of the second-look biopsy harvested from the patients treated with microfracture with atelocollagen augmentation. The images show that the regenerated cartilages were abundant in type II collagen with hyaline-like appearance. HE = hematoxylin & eosin, MT = Masson’s trichrome, SO = safranin O, AB = Alcian blue, TB = Toluidine blue, Col I=Collagen type I, Col II=Collagen type II
