PTPRC and lymphoma: Immuno-phenotyping revealed that all lymphomas in Eμ-Myc;Ripk3−/− mice were, as expected, of pro/pre-B (B220+sIg−) or B (B220+sIg+) origin, although there was an increased portion of mixed pre-B/B lymphomas compared with the control Eμ-Myc mice (Fig. 1b).