A representative profile of MRD (OAcSGP+CD10+CD19+ or OAcSGP+CD34+CD19+ or OAcSGP+CD7+CD3+ cells, in R3 gating) in patients from B- and T-lineage ALL has been shown in Figure 2 where the patients at the end of induction 1 (Figure 2b, e, h and 2k) and in CR (Figure 2c, f, i and 2l) range around 0.01–0.03% irrespective of PB and BM. The gene discussed is CD19; the disease is acute lymphoblastic leukemia.