5073
Several in vitro DNA microarray studies have shown the importance of nuclear factor ( erythroid - derived 2 ) - like 2 ( Nrf2 ) in skin sensitization .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None