Schematic representation of the effect of TPA treatment of K562 cells on the cell-surface expression of endogenous or exogenous Rh and RhAG proteins.

Expression levels of each marker in untreated cells are designated as 100%. Bars correspond to the expression in cells treated by TPA for 48 hours. Values are from Table 2. CD44 and GPA are endogenously expressed in K562 cells and represent controls of the positive and negative effects of TPA, respectively.