Representative STR patterns of donor blood cells (top), those of recipients before HSCT (middle), and those of nails in recipients after HSCT (bottom) are shown (cases 4, 10, and 15). The percentages in parenthesis were calculated by dividing the donor-derived short tandem repeat (STR) areas by the total STR peak areas in nails of recipients. The numbers of the fragment repeats are indicated below each STR. AM indicates amelogenin gene; D8S, D8S1179; TH, TH01; D16S, D16S539; D19S, D19S433; vWA, von Willebrand factor intron A; and D2S, D2S1338.