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Bruton's agammaglobulinemia tyrosine kinase ( Btk ) is a cytoplasmic tyrosine kinase involved in the human disease X-linked agammaglobulinemia ( XLA ).
 Btk, cytoplasmic tyrosine kinase, Bruton's agammaglobulinemia tyrosine kinase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 Btk, cytoplasmic tyrosine kinase, Bruton's agammaglobulinemia tyrosine kinase