Studies were conducted on Nicotiana tabacum 1507 cultivation in an aqueous two-phase system (PD(5)) formed by adding 4% PEG (MW 20,000) and 7.5% dextran (MW 70,000) to the medium. The time course of growth and changes in the phase volumes of the PD(5) system, as well as the biosynthesis, secretion,
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