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Methamphetamine did not , however , change the expression of endothelial or inducible isoforms of nitric oxide synthase , nor did it change the number of cells positive for neuronal nitric oxide synthase mRNA expression or the amount of neuronal nitric oxide synthase mRNA per cell .
 Chemical: Methamphetamine; Chemical: nitric oxide; Chemical: nitric oxide; Chemical: nitric oxide
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: Methamphetamine; Chemical: nitric oxide; Chemical: nitric oxide; Chemical: nitric oxide