7990
E235 - mediated induction of senescence was not dependent on p21 or p53 ; however , p21 conferred protection against the growth inhibitory effects of E235 .
 Chemical: E235; Chemical: E235
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: E235; Chemical: E235