Cohort 1 clinical results. (A) Donor chimerism of the dmPGE₂-treated UCB unit during 360 days posttransplantation (percentage of total) as determined from peripheral blood mononuclear cells by analyses of informative short tandem repeat loci. (B) Cumulative incidence of neutrophil engraftment of >500 cells/mm³, in cohort 1 (n = 9, blue) compared with historical institutional control participants (n = 53, black). (C) Cumulative incidence of platelet engraftment in cohort 1 (n = 9, blue) compared with historical institutional control participants (n = 53, black).