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RATIONALE AND OBJECTIVES : To evaluate direct exposure to sodium valproate ( VPA ) during embryogenesis , we administered VPA to chick embryos and examined their social behaviors after hatching .
 Chemical: sodium valproate; Chemical: VPA; Chemical: VPA
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: sodium valproate; Chemical: VPA; Chemical: VPA