25130
By comparing with our previous studies of the same sized citrated Ag and Au NPs , the Ag - peptide NPs are much more biocompatible than the citrated Ag NPs , and nearly as biocompatible as the Au NPs , showing the dependence of nanotoxicity upon the surface charges , surface functional groups and chemical compositions of the NPs .
 Chemical: Ag; Chemical: Au; Chemical: Ag; Chemical: Ag; Chemical: Au
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: Ag; Chemical: Au; Chemical: Ag; Chemical: Ag; Chemical: Au