_:vb50942492 . _:vb50942492 . _:vb50942492 . _:vb50942492 "url:https://www.ncbi.nlm.nih.gov/pubmed/21258341"^^ . _:vb50942492 . _:vb50942492 "An asphyxiating thoracic dystrophy has_material_basis_in compound heterozygous mutation in the TTC21B gene on chromosome 2q24."^^ . _:vb50942492 .