![]() ![]() Here, using 3-D high-resolution microscopy, we analyze the GIALT of adult zebrafish with an immuno-histology approach that reveals the organization of lymphoid tissues via the labeling of T/NK cells with an antibody directed to a highly conserved epitope on the kinase ZAP70. The existence of the ILT was only recently identified in zebrafish and other fish species, highlighting the need for in-depth characterizations of the gill-associated lymphoid tissue (GIALT) in teleosts. Yet, structured MALTs have been recently discovered in Atlantic salmon ( Salmo salar L.), including the interbranchial lymphoid tissue (ILT) in the gills. Teleost MALTs are commonly perceived as diffuse and scattered populations of immune cells throughout the mucosa. However, our understanding of the structural organization of its immune system remains incomplete, especially the mucosa-associated lymphoid tissues (MALTs). The zebrafish is extensively used as an animal model for human and fish diseases. 8INRAE, UVSQ, VIM, Université Paris-Saclay, Jouy-en-Josas, France.7Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University & Research, Wageningen, Netherlands. ![]() 6Section of Anatomy, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway. ![]()
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