Immunofluorescent Staining: Peripheral blood mononuclear cells from a healthy domestic Cat were double-stained with Mouse anti-Feline CD5-FITC (Cat.AM08111FC-N) and Mouse anti-Feline CD8-PE. Small lymphocytes were then gated and analyzed by two-color flow cytometry on a FACScan (TM) flow cytometry (BDIS, San Jose, CA). Amount Used: 0.2 ug/10e6 cells.