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Analysis of DNA sequences of the human chromosomes 21 and 22 performed using a specially designed MegaGene software allowed us to obtain the following results. Purine and pyrimidine nucleotide residues are unevenly distributed along both chromosomes, displaying maxima and minima (“waves”) with a period of about 3 Mbp. Distribution of G+C along both chromosomes has no distinct maxima and minima, however,...
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