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It takes guts to make a single lumen

A new study of the zebrafish intestine has uncovered a transcriptional hierarchy controlling lumen formation and proposes a model for how transcellular and paracellular transport synergize to ensure that only a single lumen is produced.

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Figure 1: The single luminal space of the zebrafish intestine and neural tube are formed in discrete steps.
Figure 2: The luminal space in the intestine expands by ion and water transport through transcellular and paracellular routes.

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Belting, HG., Affolter, M. It takes guts to make a single lumen. Nat Cell Biol 9, 880–881 (2007). https://doi.org/10.1038/ncb0807-880

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