Protein S binding to human endothelial cells is required for expression of cofactor activity for activated protein C - Hackeng, TM; Hessing, M; Van’t Veer, C; Meijer-Huizinga, F; Meijers, JCM; De Groot, PG; Van Mourik, JA; Bouma, BN (J Biol Chem, 1993)