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Methamidophos exposure during the early postnatal period of mice : Immediate and late - emergent effects on the cholinergic and serotonergic systems and on behavior .
 Chemical: Methamidophos
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: Methamidophos