22756
The unfolded protein response ( UPR ) is a cell - signaling system that detects the accumulation of unfolded protein within the endoplasmic reticulum ( ER ) and initiates a number of cellular responses to restore ER homeostasis .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None