CONTEXT : 17alpha-Hydroxylase deficiency is a rare form of congenital adrenal hyperplasia caused by CYP17 gene mutations .
O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O O O O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O O B-GeneOrGeneProduct O O O