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Representative Picro Sirius Red (PSR) stained images of 1-month PDL from wt/wt (A), wt/ko (B), ko/wt (C), and ko/ko (D) viewed under polarized light. Images taken at 40X magnification. n = 5 mice/genotype, 5 sections/mouse. Bar in A = 25 μm and applies to all panels. E. Total collagen I content of PDL at 1-, 3-, and 12-month age points. *p<0.05 compared to wt/wt. #p<0.05 compared to ko/ko.
