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Arrow-shaped strands form a central beta sheet in this caspase enzyme protein model, flanked on both sides by coiled helices. Thin looping chains wind over the top and trail from the bottom, linking each section of the fold in a clean ribbon style. The open structure lets you see straight through to the sheet at its core. It suits a cell biology or biochemistry classroom, a lesson on cell death and enzymes or a display shelf of protein ribbon models.

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