10209
Using an Illumina Human HT - 12 v4 expression microarray , 207 upregulated and 173 downregulated genes were identified in HepG2 cells treated with atRA .
 Chemical: atRA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: atRA