We studied a family of Dutch origin, including a mother and her 2 daughters. Informed consent and assent were obtained from the 3 probands. Blood samples were obtained from the mother and saliva was obtained from her daughters for genotyping. Fibroblasts from a skin biopsy were obtained from the mother for ex vivo studies of NPR-B activity. We compared fibroblast NPR-B expression and activity with fibroblasts from a wild-type (WT) NPR-B healthy volunteer and with the previously described proband with the activating Arg655Cys NPR-B variant (13).
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