[Tissue-specific blocking of the EcoRI site adjacent to the pseudogene for mouse oncoprotein p53].

EcoRI fragments of DNA isolated from the different mouse organs were hybridized to radioactivity labelled probe specific for the gene of oncoprotein p53. The analysis of the blot-hybridization points to the existence of the specific blockage of an EcoRI site flanking a 3.3 kb fragment of DNA including the pseudogene p53, isolated from the skin tissue. The existence of a polymorphous EcoRI site localized distally to the pseudogene p53 has been demonstrated in the DNA of mice of different lines.