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Polysaccharide and total alkaloid contents variation in different tissues of different species. (a) Polysaccharide content. (b) Total alkaloid content. There are three replicates of each sample. 2-Dh: two-year-old Dendrobium huoshanese, 2-Do: two-year-old Dendrobium officinale, 2-Dm: two-year-old Dendrobium moniliforme.
