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Structure of the EPS (and NPS) produced by different sino- and bradyrhizobia. Sinorhizobium meliloti 1021 EPS I (A) and II (B); Sinorhizobium fredii HH103 and NGR234 EPS (C); Bradyrhizobium japonicum USDA110 EPS (D); Bradyrhizobium elkanii USDA61 EPS/NPS (E); and B. japonicum USDA110 NPS (F). Dashed arrows indicate partial substitutions. α and β: α- and β-glycosidic linkages. ?: the position of the O-acetyl group is unknown.
