9189
Because Trp53 ( the mouse homolog of human TP53 ) is located with Tk1 on chromosome 11 and is critical in regulating cellular responses following exposure to DNA damaging agents , we wanted to determine if these mouse lymphoma cells harbor mutations in Trp53 .
 Trp53, mouse homolog of human TP53, Tk1, Trp53
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Trp53, mouse homolog of human TP53, Tk1, Trp53