. . . . . . . . . . . . "[Exons 1-3 of the p16 and exon 2 of the p21 genes were examined for mutations by polymerase chain reaction (PCR)/direct DNA sequencing methods in 21 fresh-frozen tissue specimens of oropharyngeal SCCs previously studied for expression and mutation (exons 5-9) of the p53 gene.]. Sentence from MEDLINE/PubMed, a database of the U.S. National Library of Medicine."@en . . . . . "2014-02-25"^^ . . "Gene-disease associations inferred from text-mining the literature."@en . "DisGeNET evidence - LITERATURE"@en . "2014-10-02T12:35:29+02:00"^^ . . . . . . . . . . . "v2.1.0.0" . "v2.1.0" .