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. 2019 Apr 25;10:870. doi: 10.3389/fimmu.2019.00870

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Copyright © 2019 Golconda, Buckley, Reynolds, Romanello and Smith.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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EdU⁺ and SpTrf⁺ cells are present in the axial organ, ovary, esophagus, and gut. (A) A transverse section of the axial organ shows EdU⁺ cells (white arrows) throughout the tissue. SpTrf⁺ cells (arrowheads) and EdU⁺SpTrf⁺ cells (yellow arrows) are also present. (B) A transverse section of the ovary shows EdU⁺ cells (arrows) and SpTrf⁺ cells (arrowheads) dispersed throughout the ovary. SpTrf proteins are also localized along the periphery of the oocytes (oo) as reported previously (29). (C) A longitudinal section of the esophagus shows EdU⁺ cells (arrows) among the columnar epithelial cells that line the lumen (L) and near the basement membrane (bm) that borders the coelomic cavity (cc). (D) A longitudinal section of the gut shows EdU⁺ cells (arrows) within the columnar epithelia as well as near the basement membrane (bm) that that faces the coelomic cavity (cc). SpTrf⁺ cells (arrowheads) are dispersed throughout the columnar epithelium, as reported previously (29). Sections are stained for DNA (DAPI, blue), actin (green), EdU (red), and SpTrf (yellow). See Supplementary Figure 3 for images of these sections prior to merging. Scale bars indicate 10 μm.