2460
Most of the studies focusing on the mechanisms of p53 activity have been performed in cultured cells upon treatment with well - established p53 - activating inputs , such as high doses of radiations , DNA - damaging drugs and activated oncogenes .
 cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 cells