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By use of chemical cleavage of mismatches adapted to fluorescence - based detection systems , we have characterized the mutations underlying alpha - Gal A deficiency in 16 individuals from six unrelated families with FD .
 alpha - Gal A deficiency, FD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 alpha - Gal A deficiency, FD