THRB and influenza: To investigate whether Pre‐Tfh or Tfh cells responding to the influenza vaccine were among the sampled TCR repertoires, and among the cells exhibiting potential functional flexibility, we mapped the LN TCR data against previously reported influenza‐specific TCRs39, 40, 41, 42, 43, 44 (in total 6153 TRA and 9198 TRB sequences; summarised in Supplementary figure 3a).