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We were able to show that incubation of A549 cells prior to particle treatment with diphenyleneiodonium ( DPI ) , a NADPH - oxidase ( NOX ) inhibitor , leads to decreased ROS formation , but this effect was not observed for the NOX inhibitor apocynin .
 Chemical: diphenyleneiodonium; Chemical: DPI; Chemical: NADPH; Chemical: apocynin
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: diphenyleneiodonium; Chemical: DPI; Chemical: NADPH; Chemical: apocynin