CD34 and acute lymphoblastic leukemia: Surface expression of CD34 (a cell surface glycoprotein involved in cell adhesion), Cadherin 2 (CDH2; a transmembrane gene involved in the formation of adherens junctions) and CD10 (a cell surface enzyme with metalloendopeptidase activity) was between two- and five-fold higher in adherent than nonadherent ALL cells (Figure 3a and Supplementary Figure S2).