25224
The cytotoxicity of the silica NPs was investigated in six different cell lines ( A549 , THP - 1 , CaCo - 2 , ASB - XIV , J - 774A . 1 , and Colon - 26 ) selected to explore the significance of organ and species sensitivity in vitro .
 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