Two-color flow cytometric analysis of IgM expression on mouse splenocytes. BALB/c mouse splenic leucocytes were preincubated with Purified Rat Anti-Mouse CD16/CD32 (Mouse BD Fc Block™) (Cat. No. 553141/553142). The cells were then stained with PE-CF594 Hamster Anti-Mouse CD3e (Cat. No. 562286/562332) and either BUV395 Rat IgG2a, κ Isotype Control (Cat. No. 563556, Left Panel) or BUV395 Rat Anti-Mouse IgM antibody (Cat. No. 564025, Right Panel). Fluorescence two-color dot plots showing the correlated expression of IgM (or Ig Isotype control staining) versus CD3e were derived from gated events with the light-scattering characteristics of viable splenocytes. Flow cytometric analysis was performed on a BD™ LSR II.