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Selected chemical structures of exopolysaccharide (EPS) repeating unit of: Rhizobium leguminosarum bv. trifoli [50,51], Rhizobium leguminosarum bv. viciae [48], Sinorhizobium meliloti EPS I [52], Sinorhizobium meliloti EPS II [53]. Glc, glucose; GlcA, glucuronic acid; Gal, Galactose; OAc, acetyl; Pyr, ketal pyruvate; OSuc, succinyl groups.
