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By electron microscopy mildly involved cartilage showed small diameter isolated crystals lying in a finely granular material. Similar granular material, staining dark with ruthenium red, was present around the crystalline deposits of the knee menisci. No intracellular crystals were seen and no relationship between crystals and the matrix vesicles was observed. This study suggests that the inital deposition of calcium pyrophosphate crystals is in the interstitium of the cartilage. The smallest deposits lie in a yet unidentified dense material that may be glycosaminoglycan.<\/jats:p>","DOI":"10.1002\/art.1780170611","type":"journal-article","created":{"date-parts":[[2007,2,14]],"date-time":"2007-02-14T16:30:01Z","timestamp":1171470601000},"page":"977-992","source":"Crossref","is-referenced-by-count":46,"title":["The articular cartilage in familial chondrocalcinosis. 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