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Localization of CD3+ cells in the jejunal mucosa. Frozen sections of control (A) and E. maxima-infected (B) chickens were labeled with a mouse anti-chicken CD3 and then stained with a fluorescein isothiocyanate-conjugated goat anti-mouse antibody. Arrows indicate IEL; arrowheads indicate parasites in the infected mucosa. Slides were slightly counterstained with Evans blue. Magnification, ×400.
