_:vb50939147 "url:https://ghr.nlm.nih.gov/condition/dystrophic-epidermolysis-bullosa"^^ . _:vb50939147 . _:vb50939147 . _:vb50939147 . _:vb50939147 . _:vb50939147 . _:vb50939147 "An epidermolysis bullosa dystrophica characterized by recurrent blistering at the level of the sublamina densa beneath the cutaneous basement membrane; it has_material_basis_in homozygous or compound heterozygous mutation in the gene encoding type VII collagen (COL7A1) on chromosome 3p21."^^ . _:vb50939147 "url:https://www.ncbi.nlm.nih.gov/pubmed/3307723"^^ . _:vb50939147 . _:vb50939147 "url:https://www.ncbi.nlm.nih.gov/pubmed/8513326"^^ .