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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.

Twelve lumpy subunits rise together in this organic model of a connexin 26 gap junction channel spanning two membranes. The column pinches in at the middle where the two halves meet, and its rough, bubbly surface shows each subunit as a long knobbed lobe running from top to bottom, with a small opening across the top face. The sculpted, almost coral-like form makes it a curious piece to hold and turn. It fits a cell biology display, a science desk or a shelf of molecular models showing how neighboring cells connect.

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