_:vb50941238 "A polygenic disease that is characterized by expression of a phenotype that requires the presence of pathogenic variants in two different genes."^^ . _:vb50941238 "url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3778050/"^^ . _:vb50941238 . _:vb50941238 . _:vb50941238 . _:vb50941238 . _:vb50941238 . _:vb50941238 "url:https://www.ncbi.nlm.nih.gov/pubmed/28977688"^^ . _:vb50941238 . _:vb50941238 "url:https://www.ncbi.nlm.nih.gov/books/NBK5191/#IX-P"^^ .