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. 1998 Jul 13;142(1):285–294. doi: 10.1083/jcb.142.1.285

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Schematic representation of the biochemical heterogeneity of D-periodic fibrils in mature articular cartilage. The thinnest fibrils (17–20 nm) are enriched in collagens IX and XI. Fibrils of intermediate size have lower contents of collagen IX, and the small proteoglycan decorin can occur as an additional component. The coexistence of collagen IX and decorin on the fibril surface is a notable feature. The thickest fibrils lack collagens IX and XI, but they frequently contain decorin. The suggested distribution of collagen IX and decorin is based on our data, whereas the distribution of collagen XI is drawn by analogy to that observed in human rib and fetal calf cartilage (Keene et al., 1995).