2989
The human ether - a - go - go - related gene ( hERG ) is a K + channel protein mainly expressed in the heart and the nervous systems and its blockade by non - cardiovascular acting drugs resulted in tachycardia and sudden death .
 Chemical: ether; 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: ether; Chemical: K +