FIELD: biotechnology, microbiology, veterinary science. SUBSTANCE: method involves culturing the strain Streptomyces avermitilis VKPM S-1440 on sowing medium containing 0.02-0.4% L-lysine followed by inoculation the nutrient medium with sowing material in the presence of carbon, nitrogen and mineral substance sources. Strain-producer is cultured under optimal conditions and the end product is isolated. EFFECT: improved method of preparing. 2 cl, 3 tbl
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