17789
Finally , 24 h of drug acting time , 5 times of the dilution factor of luciferase zymolyte , and about 2 x 10 ( 4 ) cells / well on HeLa cells in 96 - well plates were used , respectively .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None