Binding of leukocytes and platelets to PVC microscope slides identified by immunochemical staining after incubation of 1 mL of whole blood containing 3 IU of heparin/mL in the microscope slide model. (A and C) represent CD11b⁺ leukocytes. (B and D) represent CD16⁺ PMNs. Panels (A and B) are experiments with 250 μmol/L Compstatin and (C and D) with the same concentration of control peptide.