21191
Here , we found that the sensitivity of Nax channels to [ Na ( + ) ] o is dose - dependently enhanced by endothelin - 3 ( ET - 3 ) .
 Chemical: Na ( + )
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: Na ( + )