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ATF6 (activating transcription factor 6) is an endoplasmic reticulum (ER) membrane-bound transcription factor activated in response to ER stress. When unfolded proteins accumulate in the ER, ATF6 is cleaved by regulated intramembrane proteolysis. The resulting amino-terminal fragment translocates to the nucleus and activates transcription by binding to ER stress-response elements present in the promoter regions of ER stress-inducible genes including those encoding ER chaperones and components of ER-associated degradation. The mammalian ATF6 family consists of two closely related homologs, ATF6alpha and ATF6beta. ATF6alpha but not ATF6beta plays a pivotal role in transcriptional control. The monoclonal antibody was characterized in the laboratory of Professor Kazutoshi Mori of Kyoto University.