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. 2014 Jul 4;7(9):1111–1122. doi: 10.1242/dmm.015453

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© 2014. Published by The Company of Biologists Ltd

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.

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Fig. 3. — Histopathological analysis of granulomas in the brain of a zebrafish embryo. (A) Coronal section of an embryo (7 dpf; 5 days after infection with M. marinum E11) showing an early granuloma (black arrows) attached to the meninges (yellow arrow), causing impingement of the underlying brain parenchyma (*). Scale bar: 50 μm. Marked area is enlarged in panels B and C. (B) The early granuloma is composed of epithelioid macrophages (black arrow) and heterophils (arrowhead). (C) ZN stain of granuloma depicted in panel B showing the presence of acid-fast bacilli (black arrow). Scale bars: 20 μm. (D) Coronal section of an embryo (7 dpf; 5 days after infection with M. marinum E11) showing an early granuloma (black arrow) present in the submeningeal space causing severe impingement of the underlying brain parenchyma (*). Scale bar: 50 μm. Marked area is enlarged in panels E and F. (E) The early granuloma is composed of foamy macrophages (black arrow) and (F) shows moderate numbers of acid-fast bacilli (black arrow). Scale bars: 20 μm.