TP53 and hepatocellular carcinoma: Sequence analysis of the three amplicons representing partial sequence of intron 4, exon 5, partial sequence of intron 5, exon 6, exon 7, and partial sequence of intron 7 of rat p53 gene in both control and HCC-induced groups revealed seven genetic mutations in intron 5: five of these were affecting a single base and two were an insertion type.