The cellular localization of Lv-AE3 mRNA was performed in the gill with high transcript levels by ISH as described previously (Ruan et al., 2020 (link)). The digoxigenin (DIG)-dUTP-labeled DNA probe targeting Lv-AE3 was generated by using a DIG High Prime DNA Labeling and Detection Starter Kit II (Roche, Switzerland). The slices incubated by DIG-labeled probe were incubated with horseradish peroxidase (HRP)-conjugated anti-DIG antibody (Roche), and the ISH signal was developed by a diaminobenzidine (DAB, MXB Biotechnologies) reaction and the nucleus were stained with hematoxylin. The Lv-AE3 mRNA expressed cells in the gill were observed and recorded with a Leica DM-IRB light microscope (Leica, Germany).
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