Like many human PTCL, the mPTCL was clonal, had CD4 single positive T‐cell origin, expressed Tfh markers, displayed bystander B‐cell activation, and a human‐relevant oncogenic mutation in β‐catenin (Vallois et al, 2016; Fiore et al, 2020). The gene discussed is CD4; the disease is mature T-cell and NK-cell non-Hodgkin lymphoma.