The splenocyte IFN-γ secretion levels were quantified by using the Mouse IFN-γ ELISPOT Set (BD Biosciences, USA) following the manufacturer's protocol. The cells were stimulated by 24 h incubation with OVA peptide 257-264 (SIINFEKL, GenScript, China) before secondary antibody treatment. IFN-γ spot-forming cells were counted by an ImmunoSpot Analyzer ELISPOT reader (Cellular Technologies Ltd, USA).
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