RPL19 and breast cancer: Overexpression of RPL19 induces pre-activation of the unfolded protein response (UPR), including phosphorylation of pERK-like ER kinase (PERK), phosphorylation of eukaryotic translation initiation factor 2 α (eIF2a), and activation of p38 MAPK-associated stress signaling which enhanced cell death in MCF7 breast cancer cells [68].