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We just fixed downloads: every STL now comes straight from fast, reliable storage, saved under its own name, we're making 10,000 STL files and dozens of new tools, so things might break. We'll fix them ASAP.

A cytotoxic T cell latches onto a cancer cell in this two-part immune system model, frozen mid-attack. The killer T cell on the left bristles with finger-like projections, while the tumor cell on the right swells with round, bulging blebs. Between them a tight contact zone is filled with small rounded granules where the attack is delivered. Use it to explain immunology and cancer immunotherapy in a biology or medical classroom, or as a dramatic science display.

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