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MAPK activation in EBV-positive BL cell lines. (Upper) Western blot analysis of BL-positive and -negative cell lines for phospho-MAPK (P-MAPK). SVR is an angiosarcoma cell line that was used as positive control for MAPK. EBV-positive (+) and -negative (-) cell lines are indicated. (Lower) Total MAPK was used to normalize the amount of total protein in each preparation.
