TNFSF4 and influenza: Deletion of amino acids 121–183 and substitution of 114asparagine had no impact on the OX40L‐mediated effect to increase the influenza susceptibility, while deletion of amino acids 57‐183 and substitution of 90asparagine significantly impaired the effect (compared to human OX40L; 121Lys, P > 0.9; 57Pro, P < 0.05; 114Asn, P > 0.9; 90Asn, P < 0.05; Fig 5E).