3119
Biocompatibly coated nano - graphene with ultra - small sizes can be cleared out from body after systemic administration , without rendering noticeable toxicity to the treated mice .
 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