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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 B cell lymphocyte modeled as a round, bumpy sphere studded with Y-shaped antibody receptors pointing out in every direction. The membrane has a soft, lumpy surface, and each receptor shows its branching tips clearly at the end of a short stalk. Seen from any angle it reads instantly as an immune cell on patrol. A clear teaching model for immunology and cell biology classes, a classroom shelf or a science desk display.

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