3688
The human ether - a - go - go - related gene ( hERG ) encodes the rapidly activating , delayed rectifier potassium channel ( IKr ) important for cardiac repolarization .
 Chemical: ether; Chemical: potassium
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: potassium