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HLA - B27 and B60 were associated with the disease in probands , and the rate of disease concordance was significantly increased among DZ twin pairs in which the co - twin was positive for both B27 and DR1 .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 None