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Jansen's metaphyseal chondrodysplasia is a disease that results from ligand-independent activation of the type 1 of the parathyroid hormone receptor, due to one of three reported mutations.
JMC is extremely rare, and as of 2007 there are fewer than 20 reported cases worldwide. There are only 2 known families, from Dubai and Texas, in which the disease was passed from mother to daughter , and from a mother to her 2 sons.
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