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Mice doubly null for atm and p53 exhibited a dramatic acceleration of tumour formation relative to singly null mice , indicating that both genes collaborate in a significant manner to prevent tumorigenesis .
 Disease: tumour
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: tumour