The majority of Tet+ cTfh cells expressed CXCR3 (Figure 1—figure supplement 6C and D), consistent with the ‘Th1’ skew in the total CD4+ T cell (Yang et al., 2013) and cTfh cell response to influenza vaccination (Bentebibel et al., 2013). The gene discussed is CXCR3; the disease is influenza.