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The regulatory role of protein tyrosine phosphatases ( PTPases ) in this process was explored by studying the effects of a powerful PTPase inhibitor , vanadate peroxide ( pervanadate ), on the activation cascade of Jurkat human leukaemic T-cells .
 PTPase, protein tyrosine phosphatases, PTPases, Jurkat human leukaemic T-cells
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:
 PTPase, protein tyrosine phosphatases, PTPases, Jurkat human leukaemic T-cells