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Effects of different levels of prenatal zinc ( Zn ) and selenium ( Se ) on fetal neurobehavioral development remain unclear .
 Chemical: zinc; Chemical: Zn; Chemical: selenium; Chemical: Se
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: zinc; Chemical: Zn; Chemical: selenium; Chemical: Se