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Immunohistofluorescent analysis of CD4 expression by cells within human tonsil. A human tonsil cryosection (5 µm) was fixed with BD Cytofix™ Fixation Buffer (Cat. No. 554655), blocked with 5% goat serum and 1% BSA diluted in 1x PBS, and stained with BD Pharmingen™ Purified Mouse Anti-Human CD8 antibody (Cat. No. 555364) followed by BD Horizon™ BV480 Goat Anti-Mouse Ig second step antibody (Cat. No. 564877, pseudo-colored green). Sections were thoroughly washed, then stained with BD Horizon™ BV421 Mouse Anti-Human CD4 antibody (Cat. No. 562424/562425, pseudo-colored red) and Alexa Fluor® 488 Mouse Anti-Human CD19 antibody (Cat. No. 557697, pseudo-colored blue). Images were captured on a standard epifluorescence microscope. Original magnification, 20x.