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On the basis of these findings , we wanted to elucidate the origin of magnetite - mediated ROS formation and its influence on the cell cycle of A549 and H1299 human lung epithelial cells .
 Chemical: magnetite
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: magnetite