In addition, Ts24gst could be induced by oxidant stimulus of infections and increased synthesis of PGD2 [59, 60, 61], which binds to D‐prostanoid (PD) and chemoattractant‐homologous molecules on Th2 cell (CRTH) receptors, leading to suppression of the Th1 response. This evidence concerns the gene HPGDS and infection.