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Most importantly , overexpression of wild - type B7 - H4 in HEK293 cells enhanced tumor cell proliferation in vitro and tumorigenicity in vivo , promoted G1 / S phase transition .
 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