Representative dot plots in Fig 1A show the population of B220low CD5+ lymphocytes, which are B1a cells in wild type and Siglecg−/− mice and the expansion of CLL‐like cells in TCL1 and TCL1 × Siglecg−/− mice in the blood (Fig 1A). The gene discussed is CD5; the disease is B-cell chronic lymphocytic leukemia.