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Serum levels of IgG and IgM were also raised , but contrary to the findings of other observers IgA levels were normal .
 IgG, IgM, IgA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 IgG, IgM, IgA