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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.

Cut open to reveal what sits inside, this lymphocyte model shows a large wrinkled nucleus filling most of the cell. A thin rim of cytoplasm holds a few small mitochondria and vesicles around it, while the outer surface bristles with knobby microvilli on every side. The cutaway window makes the classic big-nucleus look of this white blood cell easy to explain, so it fits well in a cell biology classroom, an immunology lesson or a science display shelf.

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