Flow cytometry analysis of guinea pig spleen cells usingMouse IgG1 Isotype Control [MT128] (PF488P) (A269814). Cells were fixed, permeabilized and subsequently stained with Mouse IgG1 Isotype Control [MT128] (PF488P) (A269814) (solid line) or isotype control antibody (dashed line). The histogram derives from gated events of typical lymphocyte characteristics in forward and side light scatter.