Defects in type IIA von Willebrand disease: A cysteine 509 to arginine substitution in the mature von Willebrand factor disrupts a disulphide loop involved in the interaction with platelet glycoprotein Ib-IX - Lavergne, J-M; De Paillette, L; Bahnak, BR; Ribba, A-S; Fressinaud, E; Meyer, D; Pietu, G (Br J Haematol, 1992)