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Of 17 unique APT1 mutations in unrelated ALPS probands , 12 ( 71 % ) occurred in exons 7 - 9 , which encode the intracellular portion of Fas .
 ALPS
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 ALPS