Evaluation of Platelet adhesion and aggregation using SEM. Platelets on CUPE1.2 (A,B) and PLLA (C,D) discs were observed at same magnification. (A,C) 2000 ×, scale bar = 20 μm; (B,D) 5000×, scale bar = 10 μm. Platelets on CUPE1.2 were spherical and those on PLLA were spread.