Protein S binding to human endothelial cells is required for expression of cofactor activity for activated protein C - Hackeng, T M; Hessing, M; van’t Veer, C; Meijer-Huizinga, F; Meijers, J CM; de Groot, P G; van Mourik, J A; Bouma, B N (J Biol Chem, 1983)