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Per cent platelet aggregation in platelet rich plasma plus 7−109 leucocytes l−1 (PRP+L). Aggregation was induced with 1 μg ml−1 collagen in the presence of increasing concentrations of propofol plus saline, 100 μM L-arginine (L-Arg), 300 μM L-NG nitro arginine methyl ester (L-NAME), 10 μM haemoglobin (Hb), 100 μM zaprinast or 10 μM methylene blue (MtB). *P<0.05 in comparison with the value in propofol plus saline. Each point represents mean±s.e.mean of ten experiments.
