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. 2020 Jul 28;8:572. doi: 10.3389/fcell.2020.00572

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Copyright © 2020 Hampl, Dumkova, Kavkova, Dosedelova, Bryjova, Zahradnicek, Pyszko, Macholan, Zikmund, Kaiser and Buchtova.

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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Ultrastructural analysis of the palatal shelves at early and later stages of chameleon pre-hatching development. (A) Palatal overview of early developmental stage (126 dpo) stained with Toluidine Blue. (B–D) Epithelial cells on the tip of palate with nuclei (nu), high content of glycogen (gl), and mitochondria (mi). (E–H) Epithelial (OE) and mesenchymal cells in oral part of the palate. (F) The anlage of salivary gland (sg) invaginated from the OE. Primary cilium (arrow) in basal cell of salivary gland. (H) Primary cilium in mesenchymal cell (arrow). (I–L) Nasal part of palate with club-like cells and cells with high amount of glycogen (gl). (J) Primary cilium in epithelial cell (arrow). (L) Apoptotic bodies (ap) are present in cytoplasm of epithelial cells close to the nasal cavity. Collagen fibrils (cf) are abundant in mesenchyme with the exception of the tip of palate (arrowheads, B,D) and the area surrounding future salivary duct (arrowhead, H). (M) Palatal overview of later developmental stage (161 dpo) stained with Toluidine Blue. (N–P) Epithelial cells on the tip of the palatal shelf with high content of glycogen, collagen fibrils (cf) in mesenchyme present in high manner. (Q–T) Oral part of the palatal shelf with large intercellular spaces between epithelial cells (Q). (R) Epithelial protrusion of the salivary gland with luminal cell containing secretory granules (sg). (S) Keratohyalin granules are visible in the superficial layers of the oral part of epithelium. (T) Meissner corpuscles are surrounded by collagen fibrils (cf). (U–X) Nasal part of the palatal shelf with goblet cells (go), ciliated cells (ci) lined by motile cilia (kinocilia, ki) and club-like cells (cc).