5151
Compared to normal lymphocytes , MOLT-4 and CEM cells exhibited an altered cell cycle regulation of thymidine kinase , a much higher intracellular activity of this enzyme , and higher thymidine kinase mRNA expression .
 ( protein: enzyme, None) , ( RNA: thymidine kinase mRNA, None) , ( protein: thymidine kinase, None) , ( protein: thymidine kinase, None) , ( cell type: normal lymphocytes, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: enzyme, None) , ( RNA: thymidine kinase mRNA, None) , ( protein: thymidine kinase, None) , ( protein: thymidine kinase, None) , ( cell type: normal lymphocytes, None) 