Abstract
The nuclear DNA of several different rat strains and rat tumor lines have been analyzed with respect to Eco R1 fragments homologous to the amplified 5.8 kb Eco R1 fragment (fragment A) of Novikoff hepatoma cells. Two Eco R1 fragments, 4.8 and 4.4 kb, which hybridized to the 5.8 kb Eco R1 fragment, were found in all the genomes investigated. Although none of the examined genomes exhibited evidence of the same degree of amplification of fragment A related sequences as that of Novikoff hepatoma, several had Eco R1 fragments of various other sizes which were homologous to fragment A. These results indicate that the family of fragment A homologous sequences consists of two populations, the constant 4.8 and 4.4 kb fragments, and a second group of sequences which varies with respect to size.
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