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In recent years , increasing evidence has suggested that the messenger molecule nitric oxide ( NO ) is involved in pain mechanisms of migraine without aura .
 Chemical: nitric oxide; Chemical: NO; Disease: pain; Disease: migraine without aura
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: nitric oxide; Chemical: NO; Disease: pain; Disease: migraine without aura