However, although FFPE tissue specimens of normal liver, kidney, prostate, and malignant mesothelioma stained with 19–32 mAb exhibited reliable staining pattern and intensity [29], specimens from both CD26-positive MSTO-CD26 and JMN ctrl-shRNA cells as well as CD26-negative MSTO parent, JMN CD26-shRNA and A549 cells were all unexpectedly stained with 19–32 mAb (Fig 1A-ii). The gene discussed is DPP4; the disease is malignant mesothelioma.