FIELD: biotechnology, proteins. SUBSTANCE: growth proteins are prepared from animal serum blood by two-fold treatment with polyethylene glycol (final concentration is 5.0-7.5%). After acidification with hydrochloric acid solution polyethylene glycol concentration is brought about to 18-20%. Preparation is subjected to three-fold freezing and thawing, dried and remained as a liquid. Method ensures to obtain harmless and highly active preparation that can be used for culturing cellular cultures and viruses. EFFECT: improved method of preparing, high activity of preparation. 3 cl, 4 tbl
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