_:vb50941934 . _:vb50941934 . _:vb50941934 . _:vb50941934 "url:https://pubmed.ncbi.nlm.nih.gov/3150442/"^^ . _:vb50941934 "An amelogenesis imperfecta that is characterized by enamel of normal thickness that is hypomineralized and has a mottled appearance and that has_material_basis_in homozygous mutation in the G protein-coupled receptor-68 (GPR68) on chromosome 14q32."^^ . _:vb50941934 .