556
The purpose of this review is to describe the current body of knowledge on microRNA regulation of genes involved in lipid metabolism , and to introduce the role of microRNA in development and progression of atherosclerosis .
 None
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:  
Answer:
 None