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Section of the H. niloticus gut (immunofluorescence 20×, scale bar 50 μm). Lymphocytes that are positive for CD4 and 5-HT are scattered in the submucosa (arrows). The presence of neuroendocrine cells that are immunoreactive to 5-HT can also be noted (arrowheads). The “Display profile” function highlights the colocalization. TL = transmitted light.
