Flow cytometry analysis of guinea pig spleen cells using Mouse IgG1 Isotype Control [MT128] (PF647P) (A269824). Cells were fixed, permeabilized and subsequently stained with Mouse IgG1 Isotype Control [MT128] (PF647P) (A269824) (solid line) or isotype control antibody (dashed line). The histogram derives from gated events of typical lymphocyte characteristics in forward and side light scatter.