1883
Whereas both chemicals exerted a significant effect on primary keratinocyte ( s ) , HaCat cells , no effect was obtained with any of HepG2 , Hek293 , Caco2 , NIH3T3 , and MCF7 cells .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None