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Mycobacterium tuberculosis ( Mtb ) protein tyrosine phosphatase B ( mPTPB ) is a virulence factor secreted by the pathogen and mediates mycobacterial survival in macrophages by targeting host cell immune responses .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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