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Repeating chemical structures of some fucoidans from brown algae (A) Chorda filum [28]; (B) Ascophyllum nodosum, Fucus vesiculosus, and Fucus evanescens [22,23,31] and from marine invertebrates: sea cucumber (Holothuriodea) (C) Ludwigothuria grisea [29]; (D) Strongylocentrotus droebachiensis [17], and (E) Strongylocentrotus franciscanus [30].
