861
Overexpression of ATM cDNA in A - T cells enhanced the survival of these cells in response to radiation exposure , decreased radiation - induced chromosome aberrations , reduced radio - resistant DNA synthesis , and partially corrected defective cell cycle checkpoints and induction of stress - activated protein kinase .
 Disease: A - T
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: A - T