It is shown that the ESR spectra of triple-stranded complex formed by the polyribouridylic acid with the trideoxyadenylate spin-labelled on terminal phosphate is a superposition of the signals with strongly different width of HFS-components. This result is a structural support of the early proposed supposition about the irregular relative orientations of the oligomers in the triple-stranded complexes of oligoadenylates with poly-U.
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