Flow cytometry analysis of horse lymphocytes using Mouse IgG2a Isotype Control [97B4] (PF647P) (A269825). Cells were fixed, permeabilized and subsequently stained with Mouse IgG2a Isotype Control [97B4] (PF647P) (A269825) (solid line) or isotype control antibody (dashed line). The histogram derives from gated events of typical lymphocyte characteristics in forward and side light scatter.