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it causes a disorder known as cleidocranial dysostyosis
Dysphrasia (or more commonly known as: dysplasia)
It is estimated that Cleidocranial dysostosis occurs in about 1 in 1 million individuals worldwide. The prevalence may vary in different populations.
Dysplasia-- Abnormal changes in cells.
Dysplasia-- Abnormal cellular changes that may become cancerous.