3201
The results of the enzyme tests in the 39 subjects ( 18 percent ) who were defined as carriers but in whom DNA analysis did not identify a mutant allele were probably false positive ( although there remains some possibility of unidentified mutations ) .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 None