Flow cytometry analysis with novel anti-CD26 mAbs. A. Jurkat-CD26WT cells (red lines) or Jurkat parent cells (blue lines) were incubated with the hybridoma supernatant, and subsequently stained with PE-labeled anti-mouse Ig pAb, and analyzed by flow cytometry. B. Jurkat-CD26WT cells were incubated with the hybridoma supernatant (clone 1, 5, 11, 16, 18 or 19) or purified mouse anti-CD26 mAb (5F8) or commercial mouse anti-CD26 mAb (MBL, clone 44–4), and subsequently stained with PE-labeled anti-mouse Ig pAb, and analyzed by flow cytometry. The gray areas in each histogram show the data involving the isotype control. The mean fluorescence intensity (MFI) of each staining is shown. Data shown are repeated twice (A) and five times (B) with similar results.