Immunohistochemistry of CXCL12, CXCR4 and HE staining of mesotheliome and normal pleura samples. a~h: immunohistochemistry of CXCL12. a, b: normal pleura sample. c~h: mesothelioma samples. c, d: negative. e, f: moderate stain. g, h: strong stain. i~p: immunohistochemistry of CXCR4. i, j: normal pleura sample. k~p: mesothelioma samples. k, l: negative. m, n: moderate stain. o, p: strong stain. q~x: HE staining. q~t: normal pleura samples. u~x: mesothelioma samples.