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17. The organization has the opportunity to choose at least two optimal storage methods for strains of microorganisms placed in the working collection (storage of the strain on a nutrient medium; storage under mineral oil, storage in water or aqueous solutions; storage in a freeze-dried (l-dried) state, storage at low (from minus 20 degrees Celsius to 90 degrees Celsius) and ultra-low temperatures (in liquid nitrogen and its vapors).