Molecular Basis and Enzymatic Properties of Glucose 6Phosphate Dehydrogenase Volendam, Leading to Chronic Nonspherocytic Anemia, Granulocyte Dysfunction, and Increased Susceptibility to Infections by Dirk Roos, Rob van Zwieten, Juul T. Wijnen, Felix Gómez-Gallego, Martin de Boer, David Stevens, Claudia J. Pronk-Admiraal, Thea de Rijk, Cornelis J.F. van Noorden, Ron S. Weening, Tom J. Vulliamy, J. Eduard Ploem, Philip J. Mason, José M. Bautista, P. Meera Khan, and Ernest Beutler Blood Volume 94(9):2955-2962 November 1, 1999 ©1999 by American Society of Hematology Pedigree of the patient’s family. Dirk Roos et al. Blood 1999;94:2955-2962 ©1999 by American Society of Hematology pH curve of G6PD Volendam. Dirk Roos et al. Blood 1999;94:2955-2962 ©1999 by American Society of Hematology Analysis of genomic and complementary DNA from the patient with G6PD Volendam and her family. Dirk Roos et al. Blood 1999;94:2955-2962 ©1999 by American Society of Hematology Dirk Roos et al. Blood 1999;94:2955-2962 ©1999 by American Society of Hematology Dirk Roos et al. Blood 1999;94:2955-2962 ©1999 by American Society of Hematology Segregation of a skewed pattern of X-chromosome inactivation. Dirk Roos et al. Blood 1999;94:2955-2962 ©1999 by American Society of Hematology Electrophoretic mobility of rG6PD B and rG6PD Volendam. rG6PD B and rG6PD Volendam were electrophoresed in native 5% polyacrylamide gel. Dirk Roos et al. Blood 1999;94:2955-2962 ©1999 by American Society of Hematology