B cell immunophenotyping in mice with overt lymphomas showed no significant differences between Eμ-Myc; Rock1 WT and Eμ-Myc; Rock1 NC mice, with comparable proportions of pre-B [c-Kit−, B220+, cell surface immunoglobulin (sIg)low], mixed (c-Kit−, B220+, sIglow+high) and mature (c-Kit−, B220+, sIghigh) B cells (Fig. 1C; Fig. S1). Here, ROCK1 is linked to lymphoma.