Abstract Background Viral infection and neoplastic transformation trigger endoplasmic reticulum (ER) stress. Thus. a large proportion of the cells that must be recognized by the immune system are stressed cells. Cells respond to ER stress by launching the unfolded protein response (UPR). https://www.jmannino.com/limited-find-We-The-People-Flag-Unisex-Poly-Rich-Blend-Tee-great-choice/