The Heerlen dimorphism of protein S, an immunologic dimorphism due to dimorphism of residue 460 - Bertina, R M; Ploos van Amstel, H K; van Wijngaarden, A; Coenen, J; Leemhuis, M P; Deutz-Terlouw, P P; van der Linden, J K; Reitsma, P H (Blood, 1990)