8902
Initially , we observed that unmutated p53 is strongly expressed in premalignant mammary glands and in mammary tumors derived from the MMTV - c - myc strain .
 p53, c - myc
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 p53, c - myc