Abstract
The data confirming non-toxicity of polysaccharide from Heliantnus tuberosus L. were gained in experimental studies on acute toxicity, the mass and cellularity of the immune system and cell viability of the lymphoid organs. The assumption of the absence of allergenicity was confirmed in the experiment of delayed-type hypersensitivity reaction . Dose reduction factor was specified in the experiment of absolute survival rates. The effectiveness of the substance as a radioprotector was confirmed. NMR spectrum was established, with the use of it a presumptive structure of a matter is restored.
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