7200
By using the purified and reconstituted protein we demonstrate that cholesterol is an essential activator , whereas bile acids are important modulators of ABCG2 activity .
 Chemical: cholesterol; Chemical: bile acids
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: cholesterol; Chemical: bile acids