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Representative day 42 histology for Study 2. Consistent with the quantitative data, day 42 cell-free scaffolds in either untreated (A) or collagenase-treated (B) cartilage rings (*) showed chondrocyte infiltration and collagen-rich matrix. For both cell-seeded scaffolds (untreated cartilage, C; collagenase treated, D), chondrocytes in the scaffold were found to form dense collagen-rich clusters (arrows). Scale bar=200 μm. Color images available online at www.liebertonline.com/tea
