Histology of the tumor derived from JMN cells in the xenograft model is shown in Fig. 6C. Sarcomatous mesothelioma is shown in HE staining (Fig. 6C-a) and stained with anti-CD26 polyclonal antibody (R&D) (Fig. 6C-b). The gene discussed is DPP4; the disease is mesothelioma.