12300
Using experimental approaches , including optical tweezer ( OT ) stretching and atomic force microscopy ( AFM ) indentation , we found that RBCs in the presence of C ( 60 ) NPs are softer than normal RBCs .
 Chemical: C ( 60 )
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: C ( 60 )