ATF6 and diabetes mellitus: The protein levels of phosphorylated protein kinase RNA‐like ER kinase (p‐PERK), phosphorylated inositol‐requiring protein‐1α (p‐IRE1α), activating transcription factor 6 (ATF6), glucose regulated protein 78 (GRP78)and C/EBP‐homologous protein(CHOP) in kidney were significantly induced by diabetes (Figure 5A,B).