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Two-color flow cytometric analysis of IL-2 expressed by activated CD4-positive splenocytes. MiCK-1 Mouse Cytokine Positive Control Cells (Cat No. 554652) were permeabilized using BD Perm/Wash™ Buffer (Cat. No. 554723). The permeabilized cells were stained with Alexa Fluor® 700 Rat Anti-Mouse CD4 (Cat. No. 557956/561025) and either BD Horizon™ PE-CF594 Rat Anti-Mouse IL-2 (Cat No. 562483, Left Panel) or BD Horizon™ PE-CF594 Rat IgG2b Isotype Control (Cat No.562308, Right Panel). Two-color flow cytometric dot plots showing the correlated expression of IL-2 (or Ig Isotype control staining) versus CD4 were derived from gated events with the forward and side light-scatter characteristics of intact lymphocytes. Flow cytometry was performed using a BD™ LSR II Flow Cytometer System.