Flow cytometric analysis of K562 transfectants expressing full-length and domain-deleted Lu cDNA. (A) Transfectants tested with monoclonal antibodies against Lu gp. (B) Transfectants tested with human anti-Lu8. The number of cells is plotted on the ordinate and the fluorescence intensity is plotted on the abscissa. C denotes control cells: K562 cells transfected with Fy^b glycoprotein in the test with BRIC 108, untransfected K562 cells in all other tests.