24997
Additionally , 21 induced HepG2 cells apoptosis by arresting cell cycle at G2 / M phase , activating both the mitochondria - mediated pathway and the MAPKs pathway , as well as enhancing the intracellular production of ROS .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None