25125
In this study , we have functionalized the surfaces of silver nanoparticles ( Ag NPs , 11 . 7 +/- 2 . 7 nm in diameters ) with three biocompatible peptides ( CALNNK , CALNNS , CALNNE ) to prepare positively ( Ag - CALNNK NPs + zeta ) , negatively ( Ag - CALNNS NPs - 2 zeta ) , and more negatively charged NPs ( Ag - CALNNE NPs - 4 zeta ) , respectively .
 Chemical: silver; Chemical: Ag; Chemical: Ag; Chemical: Ag; Chemical: Ag
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: silver; Chemical: Ag; Chemical: Ag; Chemical: Ag; Chemical: Ag