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Cell surface expression of human CD26. H9 (A), MT4 (B), 15-day-old PBL (C), 3-day-old PBL (D), L cell clone B5 expressing CD26 (E), and clone C3 (F) were stained with monoclonal antibody against human CD26 or CD4 (Leu3A) and analyzed by flow cytometry. CTRL indicates cells stained with secondary antibodies alone.
