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Alternating diasteromeric backbones of sulfated galactans from red seaweeds, named according to the currently accepted nomenclature of Knutsen et al., 1994. (A) Carrageenan backbones, (B) Agaran backbones. The cyclized agaran backbone (G-LA) corresponds to the idealized structure of agarose. The numbering system is shown in red.
