_:vb50945631 "url:https://pubmed.ncbi.nlm.nih.gov/7529962/"^^ . _:vb50945631 . _:vb50945631 . _:vb50945631 . _:vb50945631 . _:vb50945631 "A congenital bilateral absence of vas deferens that has_material_basis_in homozygous or compound heterozygous mutation in CFTR on chromosome 7q31.2."^^ . _:vb50945631 .