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Detection of heterozygous carriers of the ataxia - telangiectasia ( ATM ) gene by G2 phase chromosomal radiosensitivity of peripheral blood lymphocytes .
 Disease: ataxia - telangiectasia
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: ataxia - telangiectasia