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With every atom exposed on its surface , single - layered graphene shows ultra - high surface area available for efficient molecular loading and bioconjugation , and has been widely explored as novel nano - carriers for drug and gene delivery .
 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