Flowchart of the ALDH potency assay performed on attached segments of CBUs requested for CT for donor selection. 7-AAD, 7-aminoactinomycin D; FTA, Fast Technology Analysis; GlyA, glycophorin A; HSA/PBS, human serum albumin/phosphate-buffered saline; HPCA, hematopoietic progenitor cell assay.