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. 2024 Feb 15;43(6):956–992. doi: 10.1038/s44318-024-00049-w

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© The Author(s) 2024

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. Creative Commons Public Domain Dedication waiver http://creativecommons.org/publicdomain/zero/1.0/ applies to the data associated with this article, unless otherwise stated in a credit line to the data, but does not extend to the graphical or creative elements of illustrations, charts, or figures. This waiver removes legal barriers to the re-use and mining of research data. According to standard scholarly practice, it is recommended to provide appropriate citation and attribution whenever technically possible.

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(A) Schematic of the regulatory network identified in this study controlling fate specification and differentiation of GLR glia. (B) At the neurovascular unit, endothelial cells (dark blue), pericytes (light blue), and astrocytic endfeet (yellow) form the Blood–Brain Barrier isolating the central nervous system (CNS—red) from blood circulation (gray). (C) Similarly, the GLR glia sheet-like processes (yellow with blue stripes to show a mixed astrocytic-endothelial/mural fate) isolate the C. elegans nerve ring (red) from the pseudocoelom (gray). A thin layer of head muscle arms (green) penetrates the C. elegans nerve ring and therefore GLR flat processes are in close proximity to head neuromuscular junctions (White et al, 1986). The pseudocoelom is shown larger than its actual volume.