Grouper spleen cells were cultured to 100% confluence in 12-well plates or 35-mm glass-bottom dishes (Cellvis, Hangzhou, China; catalog number D35-14-1-N) at 28°C for 24 h. After the cells were infected with SGIV-Gx at a multiplicity of infection (MOI) of 1 at 28°C for 6 h, they were then washed with phosphate-buffered saline (PBS: 10 mM Na2HPO4⋅12H2O, 2 mM KH2PO4, 137 mM NaCl, 1% NaN3) and collected for further use (Yu et al., 2019a (link)).
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