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Utilizing the intrinsic near - infrared ( NIR ) optical absorbance , in vivo graphene - based photothermal therapy has been realized , achieving excellent anti - tumor therapeutic efficacy in animal experiments .
 Chemical: graphene
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: graphene