Fluorescent activating cell sorting (FACS) analysis of leukemic cells revealed an immature CD8+CD4+/− cell surface phenotype (Fig 1C; Appendix Fig S3C) with Lmo2 expression in the tumor T cells (Fig 1D) and clonal immature T‐cell receptor (TCR) rearrangement (Fig 1E). The gene discussed is CD8A; the disease is neoplasm.