Rats were sacrificed by cervical dislocation. Peripheral blood mononuclear cells (PBMCs) were isolated from fresh heparinized blood samples of rats by density gradient separation using Ficoll density gradient (TBD Science, China). PBMCs were then stained with the PE-anti-CD8, FITC-anti-CD4 (BioLegend, San Diego, USA), and incubated at 4 °C for 30 min (avoid light). Subsequently, cells were washed twice with PBS and re-suspended in a 4% paraformaldehyde solution with a final volume of 300 μL for analysis. The percentage of CD4+ T cells and CD8+ T cells in peripheral blood were detected by flow cytometry and analyzed by FlowJo VX (Treestar, USA).
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