FIELD: medicinal immunology, medicine, biochemistry. SUBSTANCE: method is carried out by successive precipitation of CIq-complement from serum blood by dialysis in the presence of EDTA against solutions of low ionic strength and containing δ--aminocaproic acid at the first precipitation and hexamethylenediamine - at the second one. Final precipitation with ammonium sulfate results to preparing a preparation CIq. Invention can be used for test-systems development and for research aims also. EFFECT: improved method of preparing, high purity and activity. 1 ex
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