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Trichrome staining (×100) of the supraspinatus (SS) showed significantly more fibrosis and fatty infiltration in repair only and PBS groups compared with the group receiving cell injection. Area fraction of collagen was quantified as the area of collagen staining divided by the total area of the image. Area fraction of fat was quantified as the area occupied by fat divided by the total area of the image. Solid lines indicate P < .05. PBS, phosphate-buffered saline.
