Adhesion of CHO cells to a fibrinogen-coated surface in a laminar flow chamber at different shear rates. (A) Phase-contrast microphotographs of CHO α_IIbβ₃-D723 (top panel) and CHO α_IIbβ₃-H723 (bottom panel) at shear rates of 50, 150, 300, and 600 s⁻¹ (magnification ×20). (B) Quantification of the number of adherent cells in 4 different 0.8-mm² fields. Bars represent the means plus or minus 2.5 SD.