FIELD: biotechnology. SUBSTANCE: fraction having molecular weight 10-100 kDal is isolated of destroyed cells of eucariots. Desired product is purified by sorption and desorption on ion-exchange resin. The process is followed by fractionating of active fraction, impurities being precipitated by organic solvents having concentration 25-30 vol Said fractionating is carried out at 37-39 C with the help of ethanol. EFFECT: improves efficiency of the method. 5 cl, 8 tbl
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