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. 2018 Oct 15;32(1):1–17. doi: 10.1293/tox.2018-0042

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©2019 The Japanese Society of Toxicologic Pathology

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License. (CC-BY-NC-ND 4.0: https://creativecommons.org/licenses/by-nc-nd/4.0/）.

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Fig. 9. — Morphology of the parietal and visceral yolk sac in rats and morphological differences in the yolk sac between rats and humans. a. Parietal yolk sac on GD 9.5 in rats. HE stain. Bar = 50 µm. b. Visceral yolk sac on GD 9.5 in rats. HE stain. Bar = 50 μm. c. Metallothionein expression in the visceral yolk sac on GD 17 in rats. Bar = 50 µm. Lower schema. Morphological differences of yolk sac between humans and rats (early stage and middle/late stage).