CD19 and lymphoma: As we hypothesized that the RHOA-G17V mutation may alter the interactions with bystander cells, the numbers and duration of cell–cell contacts between the lymphoma cell lines HH and HuT78 expressing RHOA-G17V or transfected with an empty vector and the CD19- and CD3-positive endogenous human lymphoid cells were measured; however, there was no difference between the HH and HuT78 cells expressing RHOA-G17V and RHOA-WT (Supplementary Figure S5).