Fig. 3

Scanning electron microscopy (SEM) of the platelets at different storage durations and temperatures. Aged and refrigerated platelets showed morphologic changes including bulbous protrusions and pseudopods, indicating platelet activation. Magnification, ×20,000: a fresh platelets, b platelets stored at 22 °C for 2 days, and c platelets stored at 4 °C for 2 days