23889
Antioxidants ( melatonin ) and JNK or p38 inhibitors decreased significantly arsenic - induced ATF2 expression .
 Chemical: melatonin; Chemical: arsenic
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: melatonin; Chemical: arsenic