[Stereospecific DNA anomalies in the human chromosome 21].

Using our own original computer program, we analysed more than 10 millions b.p. of the complete nucleotide sequence in the human chromosome 21. A graphic catalogue of largest stereospecific anomalies of this sequence is presented. Clusters of different stereospecific anomalies, showing presumably areas of cooperative binding of different regulatory and structural proteins to DNA have been revealed. Most of the large stereospecific anomalies are situated in introns, being often accompanied by regions devoid of some specific dinucleotides.