9254
We confirm these hypotheses and show increased expression of metallothionein in splenic NK cells and reduction in free intracellular zinc following treatment with ptaquiloside that were completely prevented by selenium co - treatment .
 Chemical: zinc; Chemical: ptaquiloside; Chemical: selenium
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: ptaquiloside; Chemical: selenium