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it is metabolically different from the sulphated-mucopolysaccharide-collagen-producing fibroblast. The high hyaluronic acid content is much greater than that found in embryonic connective tissue and may be a significant factor in the neoplastic behaviour of the myxomatous tissue. The aggressive behaviour of the myxoma is against a simple reversion to embryonic mesenchyme. It is concluded that the myxoblast is an active mucopolysaccharide-secreting cell and that mucin in the myxoma is not a sign of cell degeneration of preexisting fibroblasts or collagen.

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