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HPSEC-RID profiles with molecular weight distribution of polysaccharides from Dendrobium officinale from (A) Yunnan, (B) Anhui, (C) Zhejiang (D) D. fimbriatum from Yunnan, (E) D. huoshanense from Anhui, (F) D. nobile and (G) D. chrysotoxum from Yunnan.
