22970
Subjects bearing HLA - DRB1 alleles of the Major Histocompatibility Complex II gene displaying a motif called RA " shared epitope ( SE ) " , have an enhanced susceptibility to suffer RA .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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