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. 2021 Mar 10;12:620659. doi: 10.3389/fgene.2021.620659

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Copyright © 2021 Leurs, Martinand-Mari, Ventéo, Haitina and Debiais-Thibaud.

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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Mgp1 gene expression on sections of late developing embryos of the small-spotted catshark Scyliorhinus canicula. (A–C) A total of 6 cm long embryos showing Mgp1 in situ hybridization, general (A) and closer (B) view on transverse sections at the level of the pectoral fin and Hematoxylin-Eosin-Saffron (HES) staining of a comparable zone to B (C). (D,E,H) Transverse sections of 7.7 cm long embryos displaying Mgp1 in situ hybridization (D,H) or HES staining (E). (F) Mgp1 in situ hybridization on a parasagittal section of the Meckel’s cartilage of a hatchling embryo with developing teeth [dotted line separates the epithelial (e) and mesenchymal (m) compartments of teeth]. (G) HES staining on a comparable zone to (F). (H) Branchial basket with gills. Mgp1 expression is detected in neural arch and vertebral body chondrocytes (filled arrowheads in B,D) before but not after mineralization (located with asterisks in D,E); in chondrocytes in the periphery of the Meckel’s cartilage before mineralization (filled arrowhead in F) and of other skeletal elements (filled arrowhead in H); in the connective tissue cells that surround vasculature in gills (open arrowhead in H). Mc, Meckel’s cartilage; nc, notochord; nt, neural tube. Scales are in μm.