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If adolescence also represents a period of brain organization in human beings , then the timing of exposure to sex - typical hormones at puberty should have long - term effects on sex - typed characteristics : individuals with early timing should be more sex - typed than individuals with late timing .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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