8598
In the present study , to investigate the effects of p53 knockout on OTA - induced mutagenicity , apoptosis , and karyomegaly in renal tubular cells , p53 - proficient and p53 - deficient gpt delta mice were given 1 and 5mg / kg of OTA for 4 weeks .
 Chemical: OTA; Chemical: OTA
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: OTA; Chemical: OTA