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Abnormal morphology of collagen fibers in cartilage. In cartilage, collagen II, actually a collagen II:IX:XI heterofibril, is by far the most important type of collagen. A number of abnormalities may be appreciated by electron micrography or biochemical investigations, including sparse collagen fibers in the cartilage matrix. [HPO:probinson, PMID:11879535, PMID:7757081, PMID:9468540]
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