20065
We examined the relation between DNA damage and the clonogenic potential of 3 human cell lines , HepG2 , HT29 and A549 , treated with bare 20nm or 200nm silver nanoparticles ( AgNPs ) .
 Chemical: silver
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