FIELD: preparative and technical biochemistry. SUBSTANCE: invention relates to preparing the biologically active chemical compound - protein product used both in cellular biology and practical medicine and veterinary science. Invention relates to glycoprotein isolated from animal and human blood serum of the following formula of N-terminal fragment: R-Asn-Thr-Pro-Lys-Gly-Ile-Ala-Ala-Ala-Phe-Lys where R - a residue of oligosaccharide of the general formula: (Man)3-5-(GleNAc)2 where Man - a residue of mannose; GlcNAc - a residue of N-acetylglucoseamine. Serum glycoprotein shows the biological activity at superlow doses - at concentrations 10-14-10-19 M, its molecular mass is 12.5 kDa. EFFECT: glycoprotein indicated above, high biological activity of glycoprotein. 6 tbl, 9 ex
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