Recipient chimerism is greater after R+/D− compared with R−/D+ HSCT. Comparison of chimerism levels according to recipient/donor serostatus in the entire evaluable cohort, the sibling donor cohort, and the cohort without clinically significant GvHD. The horizontal bars indicate the respective medians. Comparisons between R−/D+ and R+/D− cohorts were performed using a 2-tailed Mann-Whitney U test.