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One type of expolymer, Transparent Exopolymers (TEP), found in both marine and aquatic ecosystems, are free-floating acidic polysaccharides of a gel-like consistency, originally defined by their ability to be stained by acidic Alcian Blue. Their free-floating characteristic sets TEPs aside from other extracellular polymeric substance subgroups where exopolymers exists as cell coating, dissolved slime or as part of biofilm matrices.