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A Marburg virus model shown as one long filament that curls into a crossing loop at the top and trails down to a rounded free end. The whole envelope tube is covered in a rough, pitted surface that reads like the knobbly coat seen in electron micrographs, and the gentle S-curve gives it a natural, drifting shape. With no base and a single continuous strand, it makes a striking display piece for a microbiology shelf or a classroom lesson on filoviruses and how their unusual thread-like shape differs from round viruses.

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