The Dynal Reli SSO (Dynal Biotech, Hamburg, Germany) reverse line blot strip assay was used for molecular typing of the HLA-A and HLA-B locus alleles of maternal cells, fetal cells, and culture-expanded amniotic fluid–derived MSCs from the same sample. The HLA-A and HLA-B type of the culture-expanded amniotic fluid–derived MSCs is identical to the fetal HLA-A and HLA-B type and mismatched with the maternal HLA-A and HLA-B type. Upward arrows indicate maternal specific HLA antigens, and downward arrows indicate fetal-specific HLA antigens.