_:vb50944322 . _:vb50944322 "A heart conduction disease characterized by orthostatic intolerance that has_material_basis_in heterozygous mutation in the SLC6A2 gene on chromosome 16q12.2."^^ . _:vb50944322 . _:vb50944322 "url:https://rarediseases.info.nih.gov/diseases/9597/postural-orthostatic-tachycardia-syndrome"^^ . _:vb50944322 . _:vb50944322 . _:vb50944322 . _:vb50944322 "url:https://www.ncbi.nlm.nih.gov/pubmed/23580201"^^ . _:vb50944322 .