641
Using DNA as the starting material , we screened the ATM gene in 92 A - T patients , using an optimized single - strand conformation polymorphism ( SSCP ) technique that detected all previously known mutations in the polymerase chain reaction ( PCR ) segments being analyzed .
 A - T
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 A - T