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A multi - component nanosystem based on graphene and comprising individual cyclodextrins at its surface is assembled , creating hybrid structures enabling new and important functionalities : optical imaging , drug storage , and cell targeting for medical diagnosis and treatment .
 graphene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 graphene