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The picrosirius red staining for collagen fibers in the repaired area evaluated at polarized light microscope. A: The picrosirius red staining of 8 weeks; B: the semi-quantitation analysis of COL1, COL2 and COL1/COL2; C: The picrosirius red staining of 16 weeks; D: the semi-quantitation analysis of COL1, COL2 and COL1/COL2.
