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The current study examined nitric oxide synthase expression and activity and protein nitration in striata of animals administered saline or neurotoxic regimens of methamphetamine at postnatal days 60 and / or 90 , resulting in four treatment groups : Saline : Saline , METH : Saline , Saline : METH , and METH : METH .
 Chemical: nitric oxide; Chemical: methamphetamine; Chemical: METH; Chemical: METH; Chemical: METH; Chemical: METH
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: nitric oxide; Chemical: methamphetamine; Chemical: METH; Chemical: METH; Chemical: METH; Chemical: METH