Expression of MAC neoepitope on PMN and EC. Upper panel: PMN were stimulated with CVF 6·14 U/ml for 5 min (a) or PLN 1 U/ml for 15 min in the presence of 15% normal human serum (b), or, as control, of 15% heat-inactivated human serum (c). Lower panel: EC were stimulated with CVF 6·14 U/ml for 5 min (d) or PLN 1 U/ml for 15 min in the presence of 15% normal human serum (e), or, as control, of 15% heat-inactivated human serum (f).