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In this study , we therefore tested the dependence between the age of fullerene films ( from one week to one year ) and the proliferation , viability and metabolic activity of human osteosarcoma cells ( lines MG - 63 and U - 2 OS ) .
 Chemical: fullerene
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: fullerene