3020
Pb caused impaired Na ( + ) / K ( + ) - ATPase activity in gills , but not in rectal gland .
 Chemical: Pb; Chemical: Na ( + ); Chemical: K ( + )
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: Pb; Chemical: Na ( + ); Chemical: K ( + )