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The preferential serum IgA response observed in the patient population suggests that bronchial associated lymphoid tissue in the diseased lung is an important source of circulating IgA .
 serum IgA, IgA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 serum IgA, IgA