CD34 and acute lymphoblastic leukemia: Comparison of the gene expression signature of iB-ALL blasts with those of human foetal live HSPC populations showed that that the iB-ALL blasts resemble the most immature foetal liver HSPCs, similar to that of Lin−ve CD34+ve CD38−ve CD19−ve foetal HSPCs as opposed to the distinct signature of foetal liver B-cell committed progenitors.