C57BL/6 murine splenocytes are stained with FITC Anti-Mouse CD45R/B220 Antibody and Biotin Anti-Mouse IgD Antibody followed by Streptavidin-AF 647 (Left). Splenocytes are stained with FITC Anti-Mouse CD45R/B220 Antibody and Biotin Rat IgG2a, κ Isotype Control followed by Streptavidin-AF 647 (Right).