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A block of cardiac muscle cells is cut away to show the striations, oval nuclei and zigzag intercalated discs that join one heart cell to the next. Fine horizontal ribbing runs across every cell, while small button-like desmosomes and junctions line the wavy seams where the cells meet. A tall cylinder that stands upright, it makes the structure of heart muscle easy to see. A realistic cell biology model for a physiology or cardiology classroom, a lab desk, or a science display shelf.

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