XBP-1, X-box-binding protein 1, Tax-responsive element-binding protein 5, XBP1, TREB5, XBP2, transcription factor, hepatocyte growth, plasma cell differentiation, immunoglobulin secretion, unfolded protein response, UPR, endoplasmic reticulum, ER, unfolded protein response, UPR, UPR element, UPRE, CRE-like element, TPA response elements, TRE, Major affective disorder 7, MAFD7, transcription, transcription regulation, alternative splicing, metabolism, pancreas development, cell maturation, and immune response