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Two-color flow cytometric analysis of I-A/I-E MHC class II alloantigen expression on C57BL/6 mouse splenocytes. Splenic leucocytes from either \"M5/114-negative\" SJL (Left Panel) or \"M5/114-positive\" C57BL/6 (Right Panel) mice were preincubated with Purified Rat Anti-Mouse CD16/CD32 antibody (Mouse BD Fc Block™) (Cat. No. 553141/553142). The cells were then stained with BD Horizon™ BV605 Rat Anti-Mouse I-A/I-E (Cat. No. 563413) and PE Hamster Anti-Mouse CD3 (Cat. No. 553064/553063/561824) antibodies. Two-color flow cytometric dot plots showing the expression of I-A/I-E MHC class II alloantigens versus CD3 were derived from gated events with the forward and side light-scatter characteristics of viable leucocytes. Flow cytometric analysis was performed using a BD™ LSR II Flow Cytometer System.