Figure 2. Effects of the supernatant from endothelial cells (EC) on platelet aggregation. (A) Changes in light transmission of platelet-rich plasma (PRP). Control = PRP stimulated with collagen (4 micro gram/ml); basal = same conditions as in control except that EC supernatant was added; Bk = same conditions as in basal except that EC were stimulated with bradykinin (1.0 micro Meter). (B) Percentage response of antiaggregation derived from EC. Both basal and Bk showed significant antiaggregation compared with control (both, n = 6). Stimulation of EC with Bk vigorously enhanced the antiaggregation derived from EC. *Significantly different from control