The relative weight of the heart and the thickness of muscular fibers in the left ventricular myocardium of rats were evaluated 70-91 and 120-227 days after creating stenosis of the abdominal portion of the aorta. Half of the animals were inoculated with cardiac type-specific embryonal RNA, the rest of the animals being intact. The data were treated by the variational statistical technique, by dispersion and mathematic analyses. Administration of RNA decreased the rate of myocardial hypertrophy development.
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