9250
Here , we performed gene expression microarray analysis in splenic NK cells from mice treated for 14 days with ptaquiloside ( 5 . 3 mg / kg ) and / or selenium ( 1 . 3 mg / kg ) to identify gene transcripts altered by ptaquiloside that could be linked to the immunosuppression and that would be prevented by selenium .
 Chemical: ptaquiloside; Chemical: selenium; 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: ptaquiloside; Chemical: selenium; Chemical: ptaquiloside; Chemical: selenium