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Distribution of collagen II, collagen IX, decorin, COMP, and matrilin-3 in healthy (A–E) and OA cartilage according to pattern I (F–J) and II (K–O). The microscopic images (magnification × 20, bar = 1000 µm) for each of the three distribution patterns originate from the same samples and, thus, same location on the tibia. Abbreviations: COMP, cartilage oligomeric matrix protein; OA, osteoarthritis.
