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A number of these products are biologically active , and oxysterols may have roles in cholesterol homeostasis , neurogenesis , protein prenylation and in the immune system .
 Chemical: oxysterols; Chemical: cholesterol
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: oxysterols; Chemical: cholesterol