1984
To examine the capability of AGGR to alert for potential organ - specific toxicants , concentration - response studies were carried out in AGGR for 86 chemicals , taking as endpoints the mRNA expression levels of four selected genes .
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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