187
We performed a blind chromosomal analysis on G2 - phase lymphocytes from 7 unrelated A - T patients , 13 obligate A - T heterozygotes ( parents of the patients ) , and 14 normal controls following X - irradiation with 1 Gy in order to evaluate this cytogenetic method as a tool for detection of ATM carriers .
 Disease: A - T; 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; Disease: A - T