2681
The efflux was significantly decreased by verapamil and Ko143 , but not significantly by MK571 .
 Chemical: verapamil; Chemical: Ko143; Chemical: MK571
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: verapamil; Chemical: Ko143; Chemical: MK571