_:vb50942437 "url:https://www.ncbi.nlm.nih.gov/pubmed/22901946"^^ . _:vb50942437 . _:vb50942437 . _:vb50942437 . _:vb50942437 . _:vb50942437 "An amelogenesis imperfecta caused by homozygous mutation in the C4ORF26 gene on chromosome 4q21."^^ . _:vb50942437 .