CD40LG and infection: Consistent with the kinetics of B cell immune reconstitution after HSCT, 3 y after transplantation, P1 had normal proportions of B cells, normal serum levels of IgG, IgA, and IgM, was off IVIg replacement therapy, and reported no B cell-related infections (SI Appendix, Table S4, and case report in SI Appendix).