458
Consistent with cellular defects of AT patients , the ATM - / - cells are hypersensitive to gamma - irradiation and defective in cell - cycle arrest following radiation , correlating with a defective up - regulation of p53 .
 Disease: AT
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: AT