_:vb50941806 "A vitamin D-dependent rickets that is characterized by abnormally low levels of calcitriol and that has_material_basis_in mutation in the gene encoding 25-hydroxyvitamin D3-1-alpha-hydroxylase (CYP27B1) on chromosome 12q13."^^ . _:vb50941806 "url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7303887/"^^ . _:vb50941806 . _:vb50941806 . _:vb50941806 . _:vb50941806 "url:https://pubmed.ncbi.nlm.nih.gov/27705794/"^^ . _:vb50941806 .