In order to delineate the role of putative selectin ligands in blast cells, the expression of PSGL-1, L-selectin, CD43, CD44, sLex, Lex and CLA was assessed at the surface of myeloblasts and lymphoblasts obtained from 8 to 96 patients with AML or ALL (Figure 1 and Tables S1 and S2). The gene discussed is FUT4; the disease is acute lymphoblastic leukemia.