This assay showed that significantly lower numbers of BCP-ALL cells were found to be adhered to OP9-Gal3-KO cells than to control OP9 stroma after a 24 or 72 h co-culture and, conversely, that more cells remained floating in the medium (Figure 3A, US7; Figure 3B, TXL2). This evidence concerns the gene NME9 and acute lymphoblastic leukemia.