“…7 These data and our results support a reduced role for WASP in B-cell differentiation, proliferation, and survival, which is in line with the observations in WASP knock-out mice that show unchanged or only minimal B-cell defects. 8,9 The recognition of differential selective advantage conferred by WASP expression to T and B (and possibly other hematopoietic) lineages will provide important insights into the biology of the disease, help explain the occurrence of mixed chimerism in patients with WAS after allogeneic bone marrow transplantation, [10][11][12] and offer valuable perspectives on the possible outcomes of gene therapy for WAS.…”