2724
In this review , we examine the most commonly employed quantification approaches to relative protein abundance from peak intensity values , evaluate their individual merits , and discuss challenges in the use of the various computational approaches .
 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