The role of Interleukin-21 (IL-21) in allergic disorders: Biological insights and regulatory mechanisms. - Saadh MJ; Alfattah MA; Ismail AH; Saeed BA; Abbas HH; Elashmawy NF; Hashim GA; Ismail KS; Abo-Zaid MA; Waggiallah HA (International immunopharmacology, 2024)