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. 2013 Jan 23;8(1):e54473. doi: 10.1371/journal.pone.0054473

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© 2013 Liu et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A. A representative frame from a μOCT video of trachea dissected from a swine shows mucus (yellow arrow) extrusion from a gland duct (gd) in lamina propria (lp). B. Three-dimensional reconstructed en face view allows estimation of luminal area of the duct. In swine trachea, mucus extrusion rate is 0.095 nL/min (N = 3, ±SEM = ±0.006) at room temperature.