Western blot of survivin protein expression in tumor cell lines. Cellular lysates were prepared from F98 rat glioma, Eo771 breast carcinoma, B16 melanoma, K130 immortalized murine astrocytes, CCRF T cell lymphoblast-like cells, GL261 mouse glioma and C57BL/6 brain tissue. Proteins were resolved on 20% SDS-PAGE under reducing conditions and then transferred to PVDF membranes. Anti-survivin antibody detected a 16.5 kDa protein band corresponding to the expected molecular weight of murine, racine, and human survivin