3298
Increasing expression of peroxisome proliferator - activated receptor - gamma coactivator 1 alpha ( PGC - 1 alpha ) was also observed in HER - treated cells .
 Chemical: HER
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: HER 
Answer:
 Chemical: HER