25129
Notably , the NPs create charge - dependent toxic effects on embryonic development , showing that the Ag - CALNNK NPs + zeta ( positively charged ) are the most biocompatible while the Ag - CALNNE NPs - 4 zeta ( more negatively charged ) are the most toxic .
 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: Ag; Chemical: Ag