FucT-VII/PSGL-1 transfectants roll on L-selectin. K562-FucT-VII and K562-FucT-VII/PSGL-1 transfectants (0.5 × 10⁶/mL) were infused through a parallel plate flow chamber at a wall shear stress of 1 dyne/cm² in which purified human L-selectin (1:5; 170 sites/μm²) or P-selectin (1:60; 270 sites/μm²) were adsorbed to the lower wall of the chamber. Nontransfected K562 cells did not bind to L-selectin or P-selectin. Mean ± SEM of bound cells/mm² in multiple fields from three independent experiments.