MUM1 expression in normal activated T cells.

A 50-kd band of the expected molecular size of the MUM1 protein is seen in lanes (+) corresponding to PHA-stimulated peripheral blood T cells (at days 1, 3, 4), whereas no band is observed in lanes (−) corresponding to T cells under basal conditions (Western blotting with the MUM1p monoclonal antibody). β Tubulin levels are shown below to control for the amounts of the loaded protein.