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The present study focused on the in vitro biological effects following exposure to well - dispersed , BSA - stabilized , amorphous silica NPs whereas unmodified silica NPs where included for reasons of comparison .
 Chemical: silica; Chemical: silica
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: silica; Chemical: silica