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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Section of the gill of Boleophthalmus pectinirostris immunostained with antibodies against 5HT and Pis 1 showing the presence of Pis-immunopositive mast cells in subepithelial localization and blood vessels (BV, arrows). Scale bar = 20 µm.