19865
At 2 mu M concentration , 6His - TAT - Ainp1 is not cytotoxic in HeLa cells but suppresses the cobalt chloride - activated , hypoxia responsive enhancer - driven luciferase expression in a dose - dependent manner .
 Chemical: 6His; Chemical: cobalt chloride
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: 6His; Chemical: cobalt chloride