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Proposed major disaccharidic reapeating units of highly substituted agarans. (A) G group: 1) Agaran from Georgiella confluens (Kolender and Matulewicz, 2002), 2) Agaran (corallinan) from Lithothamnion heterocladum (Navarro et al., 2011); (B) G2S group: Agarans from: 1) Laurencia obtusa and 2) L. filiformis (Canelón et al., 2014); (C) G4S group: Agaran from Bostrichya montagnei (Duarte et al., 2002); (D) G6S group: Agarans from Polysiphonia nigrescens (Prado et al., 2008).
