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. 2017 Oct 31;7:14440. doi: 10.1038/s41598-017-14590-8

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Organization of the dorsal ganglion and tentacular nerve ring in Phoronis ovalis. Semithin (A,B,D) and ultrathin (C,E,F) transversal sections. (A) Section of the tip of the dorsal ganglion (brown), (B) section of the dorsal ganglion (brown) base: the layer of envelope cells (ec) is marked by green, (C) at the tip of dorsal ganglion, perikarya are surrounded by thin projections of envelope cells (pink), (D) the connection between the dorsal ganglion (brown) and inner ganglion (yellow); (E) a portion of the tentacular nerve ring: perikarya of second type form thin projections (arrowheads), which form bundles (asn), (F) organization of perikarya of middle zone of the dorsal ganglion: perikarya contain yolk granules (yg), centrioles (ce), and synaptic vesicles (sv). Abbreviations: ah, anal hill; ce, centriole; dg, dorsal ganglion; ec, envelope cell, ecm, extracellular matrix; epi, epithelium; gc, gland cells; ig, inner ganglion; m, mouth; mt, mitochondria; ne, neurite; pe, perikaryon; pe1, perikaryon of first type; pe2, perikaryon of second type; ph, pharynx; sv, synaptic vesicle; tnr, tentacular nerve ring; vt, multivesicular body; yg, yolk granule.