Split cell chimerism in 42 patients more than 1 year after HSCT by disease. Numbers are small, but there is a tendency to greater donor T-cell chimerism in T cell-deficient diseases, SCID, other T-cell deficiency, and WAS compared with CGD/LAD. Donor myeloid chimerism is similar between the 4 groups and B-cell chimerism approximately mirrors myeloid chimerism.